Search for geospatial/GIS data

Find GIS data held at MIT and other institutions

10,000+ results returned

  1. Title: Natural Communities, Monterey County, California, 2015

    Contributors:

    Summary: This polygon shapefile depicts natural communities (NCs) in Monterey County, California. Natural communities have been considered part of the Natural Heritage conservation triad, along with plants and animals of conservation significance, since the state inception of the Natural Heritage program in 1979. Since 1999, the California Department of Fish and Game’s Vegetation Classification and Mapping Program (VegCAMP) has undertaken the classification and mapping of vegetation throughout the state and also has assumed the role of standardizing vegetation nomenclature for California to comply with the National Vegetation Classification System (NVCS). Many vegetation types included in the current list match well with the existing CNDDB NC elements, which were based on Holland (1986). Examples include Valley Wildrye Grassland, Buck Brush Chaparral, Elephant Tree Woodland, Central California Sycamore Alluvial Woodland, and Mendocino Pygmy Cypress Forest. However, others such as Northern Claypan Vernal Pool, Southern Maritime Chaparral, and Serpentine Bunchgrass Grassland are not easily translated. The problem exists because there is a complex relationship between CNDDB NC elements and today’s view of vegetation classification — in some cases, there is a one-to-one relationship, but in most there is a many-to-one or many-to-many relationship. Furthermore, in most cases no recent surveys have been made of old CNDDB NC occurrences to ascertain the proper identity based on today’s classification standards. We think it imprudent to remove these elements from the CNDDB before assessing them and reclassifying them in terms of the currently accepted state and national standards for vegetation classification. This layer is part of a collection of GIS data for Monterey County in California. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. Monterey County, California. (2015). Natural Communities, Monterey County, California, 2015. Monterey County, Ca. Available at: http://purl.stanford.edu/vm013rt8354. California Natural Community Codes (CaCodes): The California classification is currently referenced using a series of unique codes called CaCodes. Eventually, all valid vegetation types will be replaced using a nationally standardized coding system. Until that time, CaCodes are the standard reference. CTT Codes: Holland types originally tracked by the CNDDB are referenced with a code beginning with "CTT." These are provided as "legacy information" with the understanding that Holland CTT codes and community types are no longer supported by DFG. Instead, all new information on terrestrial natural communities should use the State’s standard nomenclature as provided in the current Natural Communities List. Hierarchy Codes: The hierarchy coding system is described and used by The Ecological Society of America’s Vegetation Hierarchy Browser. Rarity and Global and State Ranks: One purpose of the vegetation classification is to assist in determining the level of rarity and imperilment of vegetation types. Ranking of alliances according to their degree of imperilment (as measured by rarity, trends, and threats) follows NatureServe’s Heritage Methodology, in which all alliances are listed with a G (global) and S (state) rank. For alliances with State ranks of S1-S3, all associations within them are also considered to be highly imperiled. A question mark (?) denotes an inexact numeric rank due to insufficient samples over the full expected range of the type, but existing information points to this rank. We have not provided the G and S rank of associations in the September 2010 version of this classification. However, associations currently designated as being of S3 or rarer are indicated with an asterisk (*) located to the left of their CaCode. Holland types that may encompass, either in whole or part, rare alliances or associations are likewise asterisked. Ranking is an ongoing process and we expect to provide association level ranks for all of the S3 or rarer entities in the future. Please note that semi-natural stands are not ranked, as these are defined and strongly dominated by non-native species.

    View full record

  2. Title: Roads of Del Norte County, California, 2004

    Contributors:

    Summary: This polygon shapefile represents roads of Del Norte County, California. This layer is part of a collection of data created by the California Department of Fish & Game. These data are intended for researchers, students, policy makers, and the general public for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production.. California Department of Fish and Game. Marine Resources Region. (2004). Roads of Del Norte County, California, 2004. California Department of Fish and Game. Available at: http://purl.stanford.edu/wv172hf7300. Converted to California Teale Albers Projection by the California Department of Fish & Game, Marine Region GIS None. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  3. Title: Roads of Humboldt County, California, 2004

    Contributors:

    Summary: This polygon shapefile represents roads of Humboldt County, California. This layer is part of a collection of data created by the California Department of Fish & Game. These data are intended for researchers, students, policy makers, and the general public for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production.. California Department of Fish and Game. Marine Resources Region. (2004). Roads of Humboldt County, California, 2004. California Department of Fish and Game. Available at: http://purl.stanford.edu/bx537rg1185. Converted to California Teale Albers Projection by the California Department of Fish & Game, Marine Region GIS None. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  4. Title: Roads of San Mateo County, California, 2004

    Contributors:

    Summary: This line shapefile represents roads of San Mateo County, California. This layer is part of a collection of data created by the California Department of Fish & Game. These data are intended for researchers, students, policy makers, and the general public for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production.. California Department of Fish and Game. Marine Resources Region. (2004). Roads of San Mateo County, California, 2004. California Department of Fish and Game. Available at: http://purl.stanford.edu/dh346dn8894. Converted to California Teale Albers Projection by the California Department of Fish & Game, Marine Region GIS None. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  5. Title: Roads of Santa Barbara County, California, 2004

    Contributors:

    Summary: This line shapefile represents roads of Santa Barbara County, California. This layer is part of a collection of data created by the California Department of Fish & Game. These data are intended for researchers, students, policy makers, and the general public for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production.. California Department of Fish and Game. Marine Resources Region. (2004). Roads of Santa Barbara County, California, 2004. California Department of Fish and Game. Available at: http://purl.stanford.edu/nq119rd8852. Converted to California Teale Albers Projection by the California Department of Fish & Game, Marine Region GIS None. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  6. Title: Roads of Santa Cruz County, California, 2004

    Contributors:

    Summary: This line shapefile represents roads of Santa Cruz County, California. This layer is part of a collection of data created by the California Department of Fish & Game. These data are intended for researchers, students, policy makers, and the general public for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production.. California Department of Fish and Game. Marine Resources Region. (2004). Roads of Santa Cruz County, California, 2004. California Department of Fish and Game. Available at: http://purl.stanford.edu/hw838wq2187. Converted to California Teale Albers Projection by the California Department of Fish & Game, Marine Region GIS None. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  7. Title: Roads of Marin County, California, 2004

    Contributors:

    Summary: This line shapefile represents roads of Marin County, California. This layer is part of a collection of data created by the California Department of Fish & Game. These data are intended for researchers, students, policy makers, and the general public for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production.. California Department of Fish and Game. Marine Resources Region. (2004). Roads of Marin County, California, 2004. California Department of Fish and Game. Available at: http://purl.stanford.edu/xh249rq9779. Converted to California Teale Albers Projection by the California Department of Fish & Game, Marine Region GIS None. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  8. Title: Roads of Orange County, California, 2004

    Contributors:

    Summary: This line shapefile represents roads of Orange County, California. This layer is part of a collection of data created by the California Department of Fish & Game. These data are intended for researchers, students, policy makers, and the general public for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production.. California Department of Fish and Game. Marine Resources Region. (2004). Roads of Orange County, California, 2004. California Department of Fish and Game. Available at: http://purl.stanford.edu/yc715rt0721. Converted to California Teale Albers Projection by the California Department of Fish & Game, Marine Region GIS None. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  9. Title: Roads of Sonoma County, California, 2004

    Contributors:

    Summary: This line shapefile represents roads of Sonoma County, California. This layer is part of a collection of data created by the California Department of Fish & Game. These data are intended for researchers, students, policy makers, and the general public for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production.. California Department of Fish and Game. Marine Resources Region. (2004). Roads of Sonoma County, California, 2004. California Department of Fish and Game. Available at: http://purl.stanford.edu/vr209jz2099. Converted to California Teale Albers Projection by the California Department of Fish & Game, Marine Region GIS None. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  10. Title: Roads of Ventura County, California, 2004

    Contributors:

    Summary: This line shapefile represents roads of Ventura County, California. This layer is part of a collection of data created by the California Department of Fish & Game. These data are intended for researchers, students, policy makers, and the general public for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production.. California Department of Fish and Game. Marine Resources Region. (2004). Roads of Ventura County, California, 2004. California Department of Fish and Game. Available at: http://purl.stanford.edu/yy154zf8415. Converted to California Teale Albers Projection by the California Department of Fish & Game, Marine Region GIS None. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  11. Title: Kelp Canopy, Hopkins Marine Reserve, Monterey Bay, California, 2004

    Contributors:

    Summary: This polygon shapefile depicts the kelp canopy for the coastal area seaward of Hopkins Marine Station, located in Pacific Grove, California. This file was created to assess the extents of Giant (Macrocystis pyrifera) and Bull (Nereocystis leutkeana) Kelp along the coast of California. The original imagery was collected using a Digital Multi-Spectral Video unit developed by Specterra Systems Inc. These data are used to assess the extent of kelp resources along the coast of California. California Department of Fish and Game. (2004). Kelp Canopy, Hopkins Marine Reserve, Monterey Bay, California, 2004. Department of Fish and Game. Available at: http://purl.stanford.edu/hj447nz0296. This image file was created from Digital Multi-Spectral Video image files. The original .IMG files created by the DMSV were converted to .FXD files to assure spectral resolution and integrity by a batchfix MS-DOS program. The images were then imported into TNTMips software and georeferenced using DOQs from the United States Geological Survey. After the images had been georeferenced they were re sampled to a 2 meter cell size using a nearest neighbor method designed by Microimages Inc. Areas with a high glint factor (reflection from the sun on choppy water) were extracted to enhance the classification process. All of the images were then mosaiced based on an affine feathering method. The images were subsequently feature mapped and automatically classified to display areas of kelp. The resampled and classified image was then exported into a Arcview BIL file. The BIL file was converted into and Arcview Grid to calculate area. The GRID data was then converted to ESRI shapefile format for display purposes using a weed tolerance of 1.35. DISCLAIMER The user is cautioned against making direct comparisons between the various kelp surveys for the following reasons: 1) Timing of the survey is important, particularly with respect to growing season conditions in the ocean, and storms and harvest levels preceding the dates of survey photography. Seasonal variability may account for differences in surveys, which may not reflect a change in the bed's extent, productivity, or harvest level. 2) Statistical significance in change of area should be evaluated. To do this, a variance parameter is needed, which is obtained by repeated measurements. Most of the coastline, however, has been surveyed only on five occasions (1967, 1989, 1999, 2002, 2003). 3) Survey methods have not been/may not be consistent. Some method of calibration between the methods needs to be performed in order to insure a change of area is not due to survey instrumentation, and not misinterpreted as a biological change. 4) An area where apparently no kelp data are present may truly represent an area devoid of kelp, or may represent an area where kelp was not detected due to poor photo quality, missing photo coverage, or other issues with data collection and processing. Photo coverage is extensive for the state, but the user is advised to consult the photo index for each year to determine whether photographs were acquired for an area of interest. The Department of Fish and Game must be credited with the collection, anlysis and distribution of these data. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  12. Title: Roads of Los Angeles County, California, 2004

    Contributors:

    Summary: This line shapefile represents roads of Los Angeles County, California. This layer is part of a collection of data created by the California Department of Fish & Game. These data are intended for researchers, students, policy makers, and the general public for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production.. California Department of Fish and Game. Marine Resources Region. (2004). Roads of Los Angeles County, California, 2004. California Department of Fish and Game. Available at: http://purl.stanford.edu/cx683wp1401. Converted to California Teale Albers Projection by the California Department of Fish & Game, Marine Region GIS None. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  13. Title: Roads of Monterey County, California, 2004

    Contributors:

    Summary: This line shapefile represents roads of Monterey County, California. This layer is part of a collection of data created by the California Department of Fish & Game. These data are intended for researchers, students, policy makers, and the general public for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production.. California Department of Fish and Game. Marine Resources Region. (2004). Roads of Monterey County, California, 2004. California Department of Fish and Game. Available at: http://purl.stanford.edu/mp326bb6274. Converted to California Teale Albers Projection by the California Department of Fish & Game, Marine Region GIS None. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  14. Title: Roads of Mendocino County, California, 2004

    Contributors:

    Summary: This line shapefile represents roads of Mendocino County, California. This layer is part of a collection of data created by the California Department of Fish & Game. These data are intended for researchers, students, policy makers, and the general public for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production.. California Department of Fish and Game. Marine Resources Region. (2004). Roads of Mendocino County, California, 2004. California Department of Fish and Game. Available at: http://purl.stanford.edu/wg526ct8145. Converted to California Teale Albers Projection by the California Department of Fish & Game, Marine Region GIS None. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  15. Title: Roads of San Luis Obisbpo County, California, 2004

    Contributors:

    Summary: This line shapefile represents roads in San Luis Obispo County, California. This layer is part of a collection of data created by the California Department of Fish & Game. These data are intended for researchers, students, policy makers, and the general public for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production.. California Department of Fish and Game. Marine Resources Region. (2004). Roads of San Luis Obisbpo County, California, 2004. California Department of Fish and Game. Available at: http://purl.stanford.edu/zk677mz2825. Converted to California Teale Albers Projection by the California Department of Fish & Game, Marine Region GIS None. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  16. Title: Stream Habitat Inventory: Russian River Basin, California, 1994-2002

    Contributors:

    Summary: This line shapefile represents stream inventory data was collected between 1994 and 2002 in tributaries to the Russian River Basin. Data was collected from approximately 180 streams comprising 750 miles (approximately 75% of the remaining steelhead habitat, and 100% percent of the known coho salmon habitat) in the basin. Crews that conducted the inventory were trained in standardized habitat inventory methods and supervised by the California Department of Fish and Game (CDFG). The methodology utilized in the Russian River basin follows the procedures in the California Salmonid Stream Habitat Restoration Manual (Flosi et al. 1998). Following completion of a desktop watershed information assessment, CDFG conducted in-field fish habitat inventories including: 1) stream channel typing; 2) habitat typing; and 3) biological surveys to describe fish habitat utilization and distribution of fish and other aquatic species basin-wide .Stream channel typing describes relatively long reaches within a stream using eight morphological characteristics. Habitat typing describes the specific pool, flatwater, and riffle habitats within a stream. There are ten components to the habitat inventory: flow, temperatures, habitat type, embeddedness, shelter rating, substrate composition, canopy, bank composition, channel type, and biological inventory. CDFG classifies 100% of the habitat types along a stream, but quantifies habitat quality for approximately 30% of the habitat units utilizing a stratified random protocol. For a complete discussion of methods see the California Salmonid Stream Habitat Restoration Manual (Flosi et al. 1998). These inventories, together with other historical, physical, biological, and social-economic information form the basis for the prioritization strategy in the basin.Rr_conditions.shp represents a renamed shp file of the original CDFG data layer. The layer was renamed for organizational purposes only. Attribute and location information were not edited. A “limiting factors analysis” provides a means to evaluate the status of key environmental factors that affect these life stages. This analysis is based on comparing measures of habitat components such as water temperature, pool depths, and shelter to a range of reference conditions determined from empirical studies and/or peer reviewed literature. CDFG has established “benchmarks” to define target habitat objectives established for north coast salmonid bearing streams. These benchmarks were adapted from the California Salmonid Stream Habitat Restoration Manual (Flosi, et al. 1998), and the Oregon Watershed Assessment Manual (OWEB, date) by Robert Coey, Associate Fish Biologist, CDFG, May 2000 and were utilized in prioritizing the condition for each stream within the Russian River basin (CDFG 2002). If the measured component’s condition does not fit within the range of the reference values, it may be viewed as a limiting factor. Once the critical limiting factors for the target species are identified, they can be defined in terms of habitat needs within the particular tributary. . 1 = Highest priority, 2 = 2nd highest priority, etc. (* = limiting factor identified from existing historical information or data, but no priority exists at this time). Circuit Rider Productions and National Oceanic and Atmospheric Administration (2002). Stream Habitat Inventory: Russian River Basin, California, 1994-2002. Circuit Rider Productions. Available at: http://purl.stanford.edu/pm110mt6998 This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  17. Title: Marine Ecological Regions, California, 2000

    Contributors:

    Summary: This polygon shapefile was screen digitized from 'Calecoregions1.jpg' a georectified digital image of the original map of California's ecoregions, include the marine ecoregions, created by Jim Bailey of the California State Department of Parks and Recreation. The marine regions from this map picture were used as the basis for the 4 regions of the Marine Protected Areas excercise, conducted as part of compliance with AB 993 in 2001. They were digitized from this map scan since no GIS product existed. This layer is part of a collection of data created by the California Department of Fish and Game. This dataset can be used to identify the outline of California's ecological provinces and regions. California Department of Fish and Game. Marine Resources Region. (2000). Marine Ecological Regions, California, 2000. California Department of Fish and Game. Available at: http://purl.stanford.edu/rj741wd8002. There is no concensus amongst agencies or marine biologists that these ecoregions have defensible ecological boundaries. They may be considered convenient management areas. The marine ecoregion boundaries are not universally accepted as valid ecosystem units. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  18. Title: nccp-hcp2006

    Contributors:

    Summary: Large scale conservation planning areas

    View full record

  19. Title: California Coastal Eelgrass Habitats, 2010

    Contributors:

    Summary: This polygon shapefile depicts eelgrass beds on the central California coast that provide foraging, breeding, or nursery areas for invertebrates, fish and birds. The most common type of seagrass in California is Zostera, or eelgrass, which grows under water in estuaries and in shallow coastal bays of the ecoregion. This flowering plant, not an alga, occurs in dense beds and helps prevent erosion and maintain stability near shore by anchoring sediment with its spreading rhizomes and slowing water flow. This file aggregates data from several sources across multiple years. Features shown here should not be considered a representation of condition for any given year, but represent the maximum extent of eelgrass found across multiple surveys over multiple years. This coverage represents eelgrass distribution on the central California coast. California Department of Fish and Wildlife Marine Resources Region. (2014). California Coastal Eelgrass Habitats, 2010. California Department of Fish and Wildlife. Marine Resources Region. Available at: http://purl.stanford.edu/nh128ss8368. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

  20. Title: California Coastal Estuaries

    Contributors:

    Summary: This polygon shapefile depicts estuaries on the California coast that form at the mouths of rivers and streams where freshwater and saltwater meet, and where the salinity varies seasonally and over longer timeframes when the river mouths get closed by sand spits or other barriers. Lagoons are coastal water bodies that are cut off from the sea and generally have low freshwater inputs. Estuaries also differ in their geomorphic origin (coastal plain estuaries, river mouth estuaries, canyon mouth estuaries and tectonic estuaries). The California Marine Life Protection Act (MLPA) defines estuaries as being seaward of the mean high tide line or the mouth of a coastal river, including any area of intertidal or subtidal terrain, together with its overlying water and associated flora and fauna. These estuaries were defined for the northern study region (Point Arena to Oregon) and for the southern study region (Point Conception to Mexico). Areas were outlined by committees comprised of experts from the MLPA Initiative, the MLPA Science Advisory Team and the California Department of Fish and Wildlife biologists. All other areas are from The Nature Conservancy Ecoregional Assessment data. Most of that content is derived from the National Wetlands Inventory (NWI) published by U.S. Fish and Wildlife. California Department of Fish and Wildlife Marine Resources Region. (2014). California Coastal Estuaries. California Department of Fish and Wildlife. Marine Resources Region. Available at: http://purl.stanford.edu/jq088zc1404. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

    View full record

Need help?

Ask GIS