United States Geological Survey Rapid Data Delivery System (RDDS) (http://rmgsc.cr.usgs.gov/rdds/index.shtml )
This is a very functional, efficient, and reliable system from which to obtain geospatial information. A user can zoom to an area of interest or select Quick Find to view a fire location, define an area for data extraction, select products, specify a projection, and download the data. Products include vector and raster data, such as active and previous fires, moderate resolution imaging spectroradiometer (MODIS), Remote Automated Weather Stations (RAWS), roads, rivers, lakes, ownership, orthoimagery, digital raster graphics (DRG), and digital elevation models (DEM). UserID/Password
USFS ArcGIS Image Server (http://fsweb.rsac.fs.fed.us/index.php?option=com_content&view=article&id=89&Itemid=245 )
USFS Geodata Clearinghouse (http://data.fs.usda.gov/geodata/)
National Park Service (NPS) Data and Information (http://www.nps.gov/gis/data_info )
RSAC – USGS Monitoring Trends in Burn Severity (MTBS) Website (http://www.mtbs.gov )
National Weather Data in shapefile Format: http://www.srh.noaa.gov/gis/kml/shapepage.htm
North American Datum of 1927 (NAD27)
Local datum well suited to the United States, Canada, Mexico, and the Carribean. Uses the Clarke 1866 spheroid.
North American Datum of 1983 (NAD83)
An earth-centered datum that corrects NAD27 coordinates based on both earth and satellite measurements. Uses the GRS 1980 spheroid. Coordinates are very similar to WGS84 coordinates and can be used interchangeably with them.
World Geodetic System of 1984 (WGS84)
Earth-centered datum common for datasets with a global extent. Uses the WGS 1984 spheroid. This is the datum that GPS coordinates are based on.
ArcGIS gives us a warning if we attempt to add data to our map that have a different GCS, or datum. For example if we have one layer depicting the 40 fire behavior fuel models. As with projection on-the-fly, the data frame’s GCS defaults to that of the first layer added to the map, which is North American 1983,. If we then try to add a fire perimeter shapefile with the WGS 1984 geographic coordinate system, we get a warning that a geographic transformation may be necessary. A geographic transformation, sometimes referred to as a datum transformation, is a set of mathematical formulas for converting coordinates from one datum to another. At this point, you may specify the transformation by clicking the transformations box in the warning dialog box
Universal Transverse Mercator (UTM)
The UTM system divides the earth into 60 zones, each six degrees of latitude wide. Figure below depicts a simplified view of the UTM zones covering the conterminous United States.
State Plane Coordinate Systems
A good example of a PCS being independent of a particular map projection. Lambert Conformal Conic projections are used for greatest in east-west extent, Transverse Mercator projections are used for greatest in north-south extent, & the some use an oblique Mercator projection.
In this case, the file (feature/shapefile or raster/ascii grid) can be re-projected to the same coordinate system so it can be displayed onscreen and used in reference by the landscape editor in FARSITE.
If during the re-projection process, the user discovers that the feature or raster does not have a defined projection; one can be added by selecting “Define Projection”, also found under “Projections and Transformations”.
While shapefiles can be displayed in both FLAMMAP and FARSITE, they cannot be used to make edits to an LCP using the FARSITE Landscape Calculator. In order to be used by the Calculator, a shapefile must be converted to an ASCII Raster. This is a two-step process and can be done in ArcGIS using the ArcToolbox. The first step is to convert the shapefile to a Raster GRID. The final step is to export the Raster GRID as an ASCII Raster.
Part A: Converting a shapefile to a Raster GRID file
Part B: Converting a Raster GRID to an ASCII Raster file
1. In ArcToolbox, click on the plus sign next to “Conversion Tools” to expand the selection. Next, click on the plus sign next to “From Raster” to expand the selection. Double-click on “Raster to ASCII” to open up the tool.
2. Below “Input raster,” select the raster GRID file you created in Part A. Under “Output ASCII raster file,” specify an output name and location. Be sure to specify the file type as .ASC. Click “OK” to create the ASCII Raster file.
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