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13 May 2009

A-CAP Save Functions Now Active


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Users of the NSIDC Antarctic Cryosphere Access Portal (A-CAP) can now save map images or download the source data for each of the layers displayed in the map. Users can specify options for data format, map projection, resolution/scale, and cropping/subsetting to the current map view. Map images provide an informative addition to publications, posters, presentations. Saving the underlying data preserves quantitative values and is useful for scientific analysis and incorporation into Geographic Information Systems (GIS) and advanced image analysis software.

Data formats for raster layers include GeoTIFF, ArcInfo ASCII, ENVI, ERDAS ER Mapper, ERDAS IMAGINE, ESRI BIL, FITS, GMT, HDF4, NetCDF, and PCI Geomatics. Vector formats include Shapefile, GML, GMT, and KMZ (Google Earth). Image formats include PNG, JPG, GIF, GeoTIFF, KMZ (Google Earth), and others.

To save a map or data, click on save map or data in the bottom left menu. To save a map, select the desired format and click save map. Otherwise, click save data for a pop-up window that lists the available raster and vector layers for the current A-CAP map (Figure 1). Choose your desired layer and settings and click save raster or save vector to begin the download. Depending on the size of the resulting data file, this could take as little as a few seconds or up to several minutes to complete. The resulting file(s) will be compressed and packaged into a ZIP file.

For more information on using A-CAP, see the A-CAP User Manual.

 

acap save data page
Figure 1. Example screen shot of the Save Data pop-up window in A-CAP. Click on the image to view a larger image.
—Credit: NSIDC

A-CAP is a geo-visualization and data download tool developed at the National Snow and Ice Data Center (NSIDC) Antarctic Glaciological Data Center (AGDC). A-CAP provides AGDC data and other Antarctic-wide parameters, including glaciology, ice core data, snow accumulation, satellite imagery, Digital Elevation Models (DEM's), sea ice concentration, and many other cryosphere-related scientific measurements. For more information on how to access data using A-CAP, see the A-CAP User Manual.

We welcome your feedback on this project. If you have questions, comments or suggestions, please contact the A-CAP Team. A-CAP was developed using MapServer, an open source development environment for building spatially-enabled Internet applications.