| contours, 5 ft interval, watershed area | |
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Data format: Shapefile File or table name: cont_02_200 Theme keywords: elevation, Contours, Contour line, Hypsography, Landform, Topography |
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Abstract:
Elevation Contours of the Napa River Watershed Area, 5 foot interval. The area covered by this data is referred to as the Watershed Area because it lies within the Napa River Watershed which is roughly the western half of the county.
The DTM is based on LiDAR data acquired in May of 2003. |
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Metadata elements shown with blue text are defined in the Federal Geographic Data Committee's (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Elements shown with green text are defined in the ESRI Profile of the CSDGM. Elements shown with a green asterisk (*) will be automatically updated by ArcCatalog. ArcCatalog adds hints indicating which FGDC elements are mandatory; these are shown with gray text.
Elevation Contours of the Napa River Watershed Area, 5 foot interval. The area covered by this data is referred to as the Watershed Area because it lies within the Napa River Watershed which is roughly the western half of the county. The DTM is based on LiDAR data acquired in May of 2003.
To show the contours of the Napa River Watershed area which is roughly the western half of the county.
NOTE: THE DOWNLAOD FILE FOR THIS LAYER IS APPROX. 250 MB. The DTM data was mapped at a scale of 1" = 200 ft and meets National Map Accuracy standards at this scale. The data was originally delivered in 12,000 ft x 12,000 ft tiles. These were mosaiced together to create this layer. Refer to the dtm_02_200 layer for details about the source data.
ground condition
Disclaimer: This GIS data is intended to provide a visual display of data for the user's convenience. Users of this data are hereby notified that the appropriate public primary information sources should be consulted for verification of the information. Although every reasonable effort has been made to assure the accuracy of this data, the County of Napa makes no warranty, representation or guaranty as to the content, sequence, accuracy, timeliness or completeness of any of the data provided herein and explicitly disclaims any representations and warranties, including, without limitation, the implied warranties of merchantability and fitness for a particular purpose. The County of Napa assumes no liability for any errors, omissions, or inaccuracies in the information provided regardless of how caused and assumes no liability for any decisions made or actions taken or not taken by the user of the data in reliance upon any information or data furnished hereunder. Because the GIS data provided is not warranted to be up-to-date, the user should check with the County staff for updated information.
650 Imperial Way, Suite 201
DTM data were photogrammetrically collected using procedures intended to meet sufficient density and accuracy for derivation of ten (10) feet contours which meet NMAS. In areas where dense vegetation or other features obscure the ground, height data may deviate from its correct elevation and may not be considered reliable without further verification. Topographic maps were generated with procedures intended to meet NMAS for 10 feet contours and spot heights. Orthophoto Maps (with 1 foot pixels) were generated with procedures intended to meet NMAS for 1:4,800 scale mapping.
Unknown
Contour mapping was derived by algorithmic interpolation of the DTM, using TerraModel v.9.6 software. Some line smoothing and manual displacement of contours was performed to enhance the cartographic expression of the representative data. This layer is 5 foot contours of the Napa Watershed. area which is roughly the western half of the county. For contours of the eastern half of the county see the "Contours 10 ft interval NON-Watershed area" layer.
Towill, Inc. provided all Aerial photography used for the compilation of DTM data.
The data was originally delivered in 12,000 ft x 12,000 ft tiles. These were mosaiced together to create this layer.
Updated layer to correct attribute problem. Random contours were mislabeled due to a rounding error that occurred during the translation from MicroStation to Shapefile format. This was corrected by Towill and re-delivered to the County.
Dataset copied.
Dataset copied.
Internal feature number.
ESRI
Elevation above sea level, in feet, for the highest point of the feature.
Contour type definition
Index Contour
Intermediate Contour
Index depression
intermediate depression
Feature geometry.
ESRI
Feature geometry.
ESRI
650 Imperial Way #201
Disclaimer: This GIS data is intended to provide a visual display of data for the user's convenience. Users of this data are hereby notified that the appropriate public primary information sources should be consulted for verification of the information. Although every reasonable effort has been made to assure the accuracy of this data, the County of Napa makes no warranty, representation or guaranty as to the content, sequence, accuracy, timeliness or completeness of any of the data provided herein and explicitly disclaims any representations and warranties, including, without limitation, the implied warranties of merchantability and fitness for a particular purpose. The County of Napa assumes no liability for any errors, omissions, or inaccuracies in the information provided regardless of how caused and assumes no liability for any decisions made or actions taken or not taken by the user of the data in reliance upon any information or data furnished hereunder. Because the GIS data provided is not warranted to be up-to-date, the user should check with the County staff for updated information.
All available layers are located in the Data Catalog on the website http://gis.napa.ca.gov/gisdata.asp. You can download the available layers by Registering, then returning to the site to download.
Go to website http://gis.napa.ca.gov/gisdata.asp to request CD by mail for an additional fee.
650 Imperial Way #201