Meridian GeoSystems has just released the US NED data in USGS Digital Elevation Model (DEM) format. The data is tiled in either 1:24K or 1 degree x 1 degree tiles. The DEM format will load up directly in MapInfo and Vertical Mapper.
The price is $295 for the entire US. More info at www.meridiangeo.com Also, for reprojecting raster data and converting formats, Global Mapper is an invaluable and relatively inexpensive tool ($179). More info on this at www.globalmapper.com Berk Charlton ========================================== Meridian GeoSystems, Inc. www.meridiangeo.com [EMAIL PROTECTED] ========================================== > -----Original Message----- > From: Will Mitchell [mailto:[EMAIL PROTECTED] > Sent: Monday, March 29, 2004 12:42 PM > To: MapInfo-L > Subject: MI-L Seamless NED Grids > > Hi all, > > > > We are happy consumers of National Elevation Dataset DEM data from > seamless.usgs.gov. One major problem is that while you have 4 GRID format > options on download none of them will come directly in to MapInfo Pro or > Vertical Mapper 3. The default format is ArcGRID (proprietary, bad form > guys). Then you get BIL, GridFloat, and TIFF.these are either image-only > (?) or beyond the GRID understanding of the tools I mentioned. See help > excerpt below. This can be conquered if you happen to have some esri > tools > around (like spatial analyst) for exporting from ArcGRID to ASCII grid. > What I'm wondering is if any of you Raster folks have a trick or a utility > to reconstitute something like DEM or ASCII grids for import into VM3 from > one of the formats? > > > > Thanks! > > ------ > > ArcGrid is an Arc/Info proprietary format. Some other software packages > can > read the ArcGrid format. Customers who specify ArcGrid will be delivered a > workspace. The workspace is not tarred or gzipped. > > BIL is a non-proprietary format made by running the GRIDIMAGE command in > Arc. The data is a simple binary raster format (signed integer data). > There > is an accompanying ASCII header file that provides file size information > (number of rows and columns). The data are stored in row major order (all > the data for row 1, followed by all the data for row 2, etc.). > > GridFloat is a non-proprietary format made by running the GRIDFLOAT > command > in Arc. The 32-bit (4 byte) is a simple binary raster format (floating > point > data). There is an accompanying ASCII header file that provides file size > information (number of rows and columns). The data are stored in row major > order (all the data for row 1, followed by all the data for row 2, etc.). > More information about binary floating point is at: > http://grouper.ieee.org/groups/754/ > http://www.math.grin.edu/~stone/courses/fundamentals/IEEE-reals.html > http://www.psc.edu/general/software/packages/ieee/ieee.html > > TIFF for NED and SRTM is a 32 bit floating point grid format. More > information on the 32 bit floating point TIFF is at: > http://partners.adobe.com/asn/developer/graphics/graphics.html > > > > > > Will Mitchell > > Mitchell Geographics, Inc. > > 496 Congress St > > Portland, ME 04101 > > ph 207.879.7769 > > fx 207.253.5756 > > <http://www.mitchellgeo.com> www.mitchellgeo.com > > --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 11166
