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GIS Data

Contents

  1. 1 Web Viewers
    1. 1.1 Data Sources for USA
      1. 1.1.1 GENERAL Repositories:
        1. 1.1.1.1 USDA Geospatial Data Gateway
        2. 1.1.1.2 USGS Elevation Products
        3. 1.1.1.3 GeoCommunity Free Data Download
        4. 1.1.1.4 Earth Explorer
        5. 1.1.1.5 NRCS GIS and Data Sites
        6. 1.1.1.6 GEON Portal
      2. 1.1.2 LiDaR Data
      3. 1.1.3 Data by State &/or County
        1. 1.1.3.1 IDAHO
        2. 1.1.3.2 OREGON
        3. 1.1.3.3 UTAH
        4. 1.1.3.4 WASHINGTON
    2. 1.2 Data Sources for UK
      1. 1.2.1 EDINA Digimap
      2. 1.2.2 Ordinance Survey
      3. 1.2.3 Landmap UK DEMs
      4. 1.2.4 NERC Earth Observation Data Centre

Web Viewers

Data Sources for USA

GENERAL Repositories:

  • Common Land Unit
  • Hydrologic Units
  • Topographic DRG 1:25,000 images
  • USGS Quad Maps (1:12,000; 1:24,000; 1:100,000; and 1:250,000)
  • National Elevation DEMs (10 m and 30 m)
  • Ortho-rectified USGS aerial photos
  • NRCS Soil Survey Maps (1:24,000)
  • Temperature Maps
  • Precipitation Maps

The United States Geological Survey is the US equivalent to the Ordinance Survey for a provider of digital elevation data sets. Many of the products can be downloaded for free... some cost. On this page you can find:

  • NED (National Elevation Datasets - @ 30 meter and 10 meter resolutions)
  • SRTM (Shuttle Radar Topography Mission - @ 30 meter resolution)
  • DEMs (from USGS 1:24000 Topographic Quadrangles .... equivalent of OS 1:25000)

This is mainly US Data, and it is all free...

Generally just satellite imagery and aerial photography, but a good resources all the same.

A comprehensive list of Web sites within the Natural Resources Conservation Service (NRCS) that are either GIS-related or contain data, documentation, or models that may be useful for GIS users.

Geosciences Network Data Portal (includes free LiDAR)

  • WEB-GIS Free distribution point for topographic and other data

LiDaR Data


Data by State &/or County

In the US, many States and Counties now have their own GIS Departments that make their data freely available on the web. This inlcudes LiDAR surveys! If you are doing work over there, just do a search for the local County Pages and have a dig around. Examples below:

Directory by State (hosted by University of Oregon)

IDAHO

  • ISU GIS Training and Research Center Geospatial Datasets
  • INSIDE Idaho (Interactive Numeric and Spatial Information Data Engine hosted by University of Idaho)

WASHINGTON


Data Sources for UK

EDINA Digimap

If you're at a subscribing UK University: most Ordinance Survey data is avaialble via Edina's Digimap If you were to download just a few of these layers from a commercial vendor, it would cost you 100's to 1000's of pounds. This is an incredible resource at your disposal. You can find all the OS Explorer, Land Ranger maps, national, regional, county and local boundaries, digital elevation data, historical maps, geological maps, and much more!

  • To use this resource, you need to login. If you are on campus (or using a VPN), this will automatically take you to your institution's login page. Off campus, you need to select alternative login, find your instiution, and then login.
  • Next, navigate to the Ordinance Survey Data Collections.
  • Inside, navigate to 'Data Download Services' and therein to Data Download.
  • From Data Download, select the data type you wish to use, and follow the wizard.
Where data is only available in a NTF format, you may find the following conversion tools helpful for converting NTFs into DXFs or MapInfo Files.

Ordinance Survey

Although the Ordinance Survey is one of the major sources of elevation data sets in the UK, you can not (that I'm aware of) download these datasets for free! They've sold the rights to do this to a host of private companies (e.g. GetMapping). Fortunately for you, as long is you are at an academic institution (UK only) you can download much of the data for free from EDINA .

This page shows all the Ordinance Survey Products.

Landmap UK DEMs

Landmap provide a 30 m raster DEM for the whole of the UK (derived from Multiple passes of an ERS SAR sensor). You can download the data in 100 km tiles, or by defining your own boundaries. This resource is free to UWA students and staff.

NERC Earth Observation Data Centre

The NERC Earth Observation Data Centre (NEODC) is a Designated Data Centre of the Natural Environment Research Council (NERC) and as such it is tasked with the acquisition, archiving and provision of access to remotely sensed data of the surface of the Earth acquired by satellite and airborne sensors.