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Messages - yanan

1
Using SLAMM / Re: MTL to NAVD88 Correction
October 21, 2010, 07:13:30 PM
The VDatum's tidal transformations are valid in the water areas only, i.e. all points in lands, islands and points that are out of our tidal transformation grids will have height results as -999999.0,when i change the point to water area,it makes sense,the point conversion result turn out to be -0.036.


2
Using SLAMM / Re: MTL to NAVD88 Correction
October 21, 2010, 08:14:48 AM
hi,
I am using the VDatum to do vertical datum correction, the test data is NED data ,Every time i try to convert an  elevation point in geographic coordinate the convertion result of the Latitude/Longitude  have no changes, but the height is always -999999.0.Would you tell me what is wrong in the process.

thank you.
3
Using SLAMM / Re: NWI to SLAMM land cover classes
September 30, 2010, 08:58:10 PM
I have chosen North Carolina as my study area,and  it's NWI codes contain  "E2UB3H", "E2UB3L", "E2UBM" and .etc,but l just could not find any information about E2UB in the Tech. Doc. I don't know where did i go wrong.
4
Using SLAMM / Re: NWI to SLAMM land cover classes
September 30, 2010, 08:22:16 AM
hi Jonathan,

When i use the VLOOKUP function, i have come across many codes that are not in the spreadsheet(SLAMM6_nwi_codes_2009.xls), then i look up these NWI codes in the technical documentation (p43-p44) and the open source code, a lot of them are determined, but still there are some codes that i cannot find, such as "E2UB3H", "E2UB3L", "E2UBM", and etc. In the open source code i have found a code named 'E2UBN' in the comment line, which is called "Tidal Creek" in SLAMM's category. Are there any relationship between them,or is there something wrong with the comment line?

thank you.