Hi All,

Could anybody please tell about these poitns?
1) waht is the difference between MapWinGIS.Grid and MapWinGIS.Image class? (As i understand Image class is for any normal picture like .bmp whereas Grid class is for Geo-Referenced image like Geotiff, am i right???)

2) I am using following code to open a geotiff file in MapControl, but everytime its giving error : "Interface Not Supported"!!
Dim grid As New MapWinGIS.Grid()
Dim success As Boolean
success = grid.Open("D:\GIS_Data_Tiles\DEM_51_06.tif")
If Not success Then
MsgBox("There was an error opening the image.")
End If
AxMap1.AddLayer(grid, True)

3) I want to access each and every Lat/Long/Altitude value stored in goetiff image (by moving the mouse over the image)and show them in three textboxes(lets say). what procedure shall i follow and what function shall i use to get this?

Thanks and regards,

I have been able to open Goetiff file using GridToImage() method. is it thr right approach?

I can access the columns and rows of the image using
x=14026
y=179926
"GridObject.CellToProj(x, y, col, row)"
but how to get the altitude value associated with this point??

hoping for reply..

The MapWinGIS.Image class is for geo-referenced image files, like tiff, gif, jpg.

The MapWinGIS.Grid class is for grids.
To show a grid in MapWindow you need to create an image of it using the GridToImage() method.

To get the value (altitude in your case) of a grid use Grid.Value()

Hope it helps,

Paul

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Thank You, I got it working.

hi,
i need to get the altitude of an Image file (dted)
how can i do this?

thanks