Sample data files in the rolling archives are provided as files in the IEEE 32-bit binary float format. This standard format provides for portability and ease of use. ArcGIS header files are provided in the Yosemite data archive, and sample header files for ArcGIS and IDL ENVI are provided in the California archive. Sample header files for ERDAS IMAGINE will be posted soon. Instructions for viewing the data files in ArcMap are provided below. Please contact us with questions about downloading and viewing data.
VIEWING DATA IN ARCMAP 9.1
This data archive is intended primarily for use by the National Park Service, and data products posted are intended for use with ArcGIS applications. Instructions for viewing files in ArcMap 9.1 are included below. These data products can also be analyzed using IDL/ENVI, Erdas IMAGINE, or read directly into models or scripts. Please contact us for additional information.
1) Downloading data
All data files included in the Yosemite archive has an associated ESRI header file '.hdr'. Be sure to download both files into the same directory. Sample header files are included in the California archive and need to be renamed to 'FILENAME.hdr'.
2) Importing data files into ArcMap
To import the data files into ArcMap, use the 'Float to Raster' Tool.
- Open the 'Conversion Tools' in the 'ArcToolbox'
- Open the 'To Raster' menu
- Double-click on the 'Float to Raster' tool
- In the 'Input floating' field, browse to the local directory and select the file to open.
- In the 'Output raster' field, type the name of the directory for the output raster (the directory name cannot be longer than 13 characters).
This will convert the floating point data file into a raster layer.
3) Projecting the raster layer
All data files in the archive have the following projection information:
Projection UTM
Zone 11
Datum WGS84
Spheroid WGS84
Units METERS
Zunits NO
Use the Project Raster tool to project the raster layer.
- Select 'Data Management Tools' in the 'ArcToolbox'
- Select 'Projections and Transformations'
- Select 'Raster'
- Select the 'Project Raster' tool
- In the new Project Raster window, select the raster layer to be project from the pull down menu or browse to it
- Name the output layer
- Click 'Select'
- Browse to 'Projected Coordinate Systems' folder, then 'UTM', then 'WGS 1984', then 'WGS 1984 UTM Zone 11N'
- Click Add
- Click Ok
Or, if you have already projected another layer in the current ArcMap frame:
- Click 'Import' and browse to another previously projected raster layer, and double-click on it
- Click Add
- Click Ok
4) The data will display in black and white by default
|
