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 Frequently Accessed Data
Layers
A Collection of commonly used GIS datasets for
California. This collection includes datasets
formally offered by the Teale Data Center. Most
data are maintained in an Albers projection to enable
overlay and integration functions, and are organized by
theme. |
 Digital
Orthophoto Quadrangle GeoTiff (DOQQ)
Orthophotos combine the image
characteristics of a photograph with the geometric
qualities of a map. The primary digital
orthophotoquad (DOQ) is a 1-meter ground resolution,
quarter-quadrangle (3.75-minutes of latitude by
3.75-minutes of longitude) image cast on the
Universal Transverse Mercator Projection (UTM) on the
North American Datum of 1983 (NAD83).
DOQ's serve a variety of purposes, from
interim maps to field references for earth science
investigations and analysis. The DOQ is useful as a
layer of a geographic information system and as a
tool for revision of digital line graphs and
topographic maps.
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 California
Digital Raster Graphics
The Digital Raster Graphic (DRG) is a raster image of a
scanned USGS topographic map including the collar
information. The source maps for DRGs were
georeferenced to the UTM grid, but DRG images for
California are available in Albers equal area
projection (see the projection information). A DRG is
useful as a source or background layer in a GIS, as a
means to perform quality assurance on other digital
products, and as a source for the collection and
revision of DLG data. DRG's can also be merged with
other digital data, e.g. DEM's or DOQ's, to
produce a hybrid digital file. |
 California
Landsat-7 Images
This product was created by the U.S. Geological
Survey (USGS) and contains Landsat data files in
Geographic Tagged Image-File Format (GeoTIFF). The
Landsat 1, 2, and 3 satellites carried the
multispectral scanner (MSS) sensors; the Landsat 4
and 5 satellites carries both the MSS and the
thematic mapper (TM) sensors; and the Landsat-7
satellite carries the enhanced thematic mapper plus
(ETM+) sensor. All three sensors are a part of an
ongoing mission to provide quality remote sensing
data in support of research and applications
activities.
This collection contains Landsat images for
the State of California, as part of the CalView
project. The images have all been reprojected to the
California Albers Projection, NAD 83 datum, and
provided in GeoTiff format.
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 Caifornia
Spot Imagery
1998-2000 SPOTView Panchromatic Imagery The State of
California has purchased statewide 10-meter, black and
white satellite imagery (SPOTView images from 1998
through 2000) from SPOT Image Corporation, and a
license to distribute imagery to State of California
agencies, local government, federal government
partners, universities, K through 12, and the
provincial government of Baja California, Mexico. We
apologize, but our license agreement with SPOT Image
Corporation does not include distribution to the
general public. Therefore, this collection is not
online for direct download, but can be ordered on
CDROM. |
 CaSIL as a
File System
You may use FTP or HTTP to access the CaSIL
data holdings and treat them as one big file
system. The collections are organized by contributing
agency. Please see the CaSIL
User's Guide for more information on how to
take advantage of this access method. |
 Planned
and Proposed Datasets
We encourage collaboration and cost-sharing by all
levels of government and the private sector in the
development/capture of digital spatial data including
(but not limited to) aerial photography, remote sensed
imagery, rivers andstreams, elevation, administrative
boundaries, government ownership, transportation
features, and land use/land. We hope that partnerships
will blossom, the overall cost of data development will
drop (due to economies ofscale and by avoiding
duplication where possible), and data that has been
developed can be found more quickly. How to make a
submission to this list... |
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