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[IDV #ZBT-754250]: DEM files

Hi Robert-

> Another thing I noticed is that the old DEMs are 16bit pixel depth and the 
> newer ones are 32bit pixel depth. Does this have anything to do with it?

I'm not sure what you mean by this but here's another way to get topography 
data.  There are topography datasets available through the catalog chooser in 
the IDV.  You can load one of these in, subsetting over the domain you want 
first and then save it to a local netCDF file.

In the Catalog chooser, select the Topography/Bathymetry dataset.  Select the 
ETOPO1 (or
any other dataset) that you want and click Add Source.  In the Field Selector, 
right click
on the data source and bring up the properties.  Under the Spatial Subset tab, 
set the bounds of the region you are interested in and click OK.  You can try 
plotting the data to make sure
you have the correct area, and/or right click on the datasource again and 
select "Write Local
Grid".  This will write the selected data to a local file.

That might be asier than piecing together the other data.

Don Murray
> -----Original Message-----
> From: Unidata IDV Support [mailto:address@hidden]
> Sent: Wednesday, April 14, 2010 10:48 AM
> To: Kirkwood, Robert
> Subject: [IDV #ZBT-754250]: DEM files
> 
> Hi Robert-
> 
> > Full Name: Robert Kirkwood
> > Email Address: address@hidden
> > Organization: WDEQ AQD
> > Package Version: 2.8u1 build date:2010-02-02 22:30 UTC
> > Operating System: Windows XP
> > Hardware: Java: home: C:\Program Files\IDV_2.8u1\jre version: 1.6.0_17 
> > j3d:1.5.2 fcs (build4)
> > Description of problem: Reading DEM: C:\Temp\w140n90.dem\W140N90.DEM
> > Data object "C:\Temp\w140n90.dem\W140N90.DEM" not compatible with "dem" 
> > data family
> 
> What is the format of this DEM data?  The only USGS forms we handle are the 
> old
> ASCII format described here:
> 
> http://rockyweb.cr.usgs.gov/nmpstds/acrodocs/dem/2DEM0198.PDF
> 
> If you think it is one of these and that this is a bug, please upload the 
> file to:
> 
> http://motherlode.ucar.edu/repository/alias/idvupload
> 
> Don Murray
> 
> Don Murray
> > ******************
> > Stack trace:
> > visad.data.BadFormException: Data object "C:\Temp\w140n90.dem\W140N90.DEM" 
> > not compatible with "dem" data family
> > at visad.data.FunctionFormFamily.open(FunctionFormFamily.java:444)
> > at ucar.unidata.data.gis.DemDataSource.makeDemData(DemDataSource.java:211)
> > at ucar.unidata.data.gis.DemDataSource.getDataInner(DemDataSource.java:163)
> > at ucar.unidata.data.DataSourceImpl.getData(DataSourceImpl.java:2235)
> > at ucar.unidata.data.DirectDataChoice.getData(DirectDataChoice.java:332)
> > at ucar.unidata.data.DataChoice.getData(DataChoice.java:637)
> > at ucar.unidata.data.DataInstance.getData(DataInstance.java:239)
> > at ucar.unidata.data.DataInstance.getData(DataInstance.java:203)
> > at ucar.unidata.data.grid.GridDataInstance.init(GridDataInstance.java:202)
> > at ucar.unidata.data.grid.GridDataInstance.<init>(GridDataInstance.java:159)
> > at ucar.unidata.data.grid.GridDataInstance.<init>(GridDataInstance.java:140)
> > at 
> > ucar.unidata.idv.control.PlanViewControl.doMakeDataInstance(PlanViewControl.java:1306)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.initializeDataInstance(DisplayControlImpl.java:3040)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.setData(DisplayControlImpl.java:3022)
> > at 
> > ucar.unidata.idv.control.PlanViewControl.setData(PlanViewControl.java:577)
> > at ucar.unidata.idv.control.PlanViewControl.init(PlanViewControl.java:434)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1302)
> > at 
> > ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1003)
> > at 
> > ucar.unidata.idv.ControlDescriptor.initControl(ControlDescriptor.java:987)
> > at ucar.unidata.idv.ControlDescriptor$1.run(ControlDescriptor.java:912)
> > at ucar.unidata.util.Misc$3.run(Misc.java:1096)
> >
> >
> >
> 
> 
> Ticket Details
> ===================
> Ticket ID: ZBT-754250
> Department: Support IDV
> Priority: Normal
> Status: Open
> 
> 
> E-Mail to and from me, in connection with the transaction of public business, 
> is subject to the Wyoming Public Records Act and may be disclosed to third 
> parties.
> 


Ticket Details
===================
Ticket ID: ZBT-754250
Department: Support IDV
Priority: Normal
Status: Open