G'day all
I have sime USGS NED data in BIL format with a .hdr file for part of Nevada.
The data is in Geographic projection (same as Geodetic?) and uses the NAD83
datum. Coordinates are in Decimal degrees and the reference point is in Lat
& Long.
Once I import the file and put in the reference point the .ers file that
looks like below;
DatasetHeader Begin
Version = "6.2"
Name = "C:\testNED_Lat&Long_NAD83_ken.ers"
LastUpdated = Wed Mar 27 20:21:21 GMT 2002
DataSetType = ERStorage
DataType = Raster
ByteOrder = MSBFirst
CoordinateSpace Begin
Datum = "NAD83"
Projection = "GEODETIC"
CoordinateType = LL
Rotation = 0:0:0.0
CoordinateSpace End
RasterInfo Begin
CellType = Unsigned16BitInteger
NrOfLines = 4741
NrOfCellsPerLine = 4050
RegistrationCoord Begin
Latitude = 41:41:30.500000199
Longitude = -116:37:29.499999892
RegistrationCoord End
NrOfBands = 1
BandId Begin
Value = "band 1"
BandId End
RegionInfo Begin
Type = Polygon
RegionName = "All"
SubRegion = {
0 0
0 4741
4050 4741
4050 0
}
RegionInfo End
RasterInfo End
DatasetHeader End
I want to reproject copies of this data to Albersea and UTM-zone 11 both in
NAD27, but ERMapper v6.21 won't seem to do this; it keeps saying that there
are problems with the output extents.
I suspect the problem is that I haven't set a cell size (it defaults to a
size of 1). Given that the Geodetic projection the units must be decimal
degrees, what cell size do I use? NED data has 30m resolution, do I need to
convert that to equivalent decimal degrees at the appropriate latitude
(41.5N)?
Hope you can help with what is probably a basic problem.
Cheers and thanks in advance
Ken Hickey
-----------------------------------------------------------------
Kenneth Hickey
Mineral Deposit Research Unit (MDRU)
Department of Earth and Ocean Sciences
University of British Columbia
6339 Stores Rd, Vancouver, BC V6T 1Z4, Canada
phone +1-604-822-3765; Fax +1-604-822-6088
email: [EMAIL PROTECTED]
.
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