I have received many useful suggestions, but I am still struggling with what
should be a simple problem. I am trying to translate a series of lat/lon
coordinates in WGS84 coordinates to lat/lon coordinates for my map (AGD66).
The code is below, and seems to mirror sample code in the GDAL tutorials.
Yes - I mean lat and lon. I'm using the datums in common use in Australia,
i.e. Australian Geodetic 1966, Australian Geodetic 1984, Australian
Geocentric 1994
From: Simon Lyngby Kokkendorff silyko-at-gmail.com |GDAL|
[mailto:r0dk224...@sneakemail.com]
Sent: Wednesday, October 19, 2011 10:32
Well, it's 'working' (sort of) but I'm still confused. I'll try to explain
better what I'm trying to do.
I have a database of map coordinates stored in WGS84 datum.
I load and display a map in my application which may, or may not, use the
WGS84 datum. I am setting up a coordinatetransformation
THORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9108"]],AUTHORITY["EPSG","4326"]],PROJECTION["Transverse_Mercator"]
I have a big clue - I have inspected the output of ExportToWKT, and the results
are interesting
With WGS84SRS
GDALError = .SetProjCS("WGS84 Datum")
Debug.Assert(GDALError = OGRError.OGRERR_NONE, GetLastErrorMsg())
GDALError = .SetWellKnownGeogCS("WGS84"
I have not used org2ogr. I have just realised that the C API for GDAL uses a
mixture of STD and CDECL. How annoying. Anyway – I have carefully checked and
all are correct. I get a stack balance problem if they are not anyway. It’s
hard to see how I could get the arguments wrong – one is the stri
Thanks for all the suggestions – they have given me many possibilities to
eliminate, but I still haven’t really got an answer to the original question.
Am I required to have proj.dll built with support for the datums/projections I
want to use, or is it sufficient to set GDAL_DATA such that gc
My program does MANY other things that GDAL can’t. I’m using GDAL as a small
part of something much larger. I need to do the transformation at runtime.
Marc,
proj4 usually comes with the gdal library. Instead of coding your own program,
first try the ogr2ogr utility[1] that comes with the gd
I’m not sure the code will help too much, but here are the relevant code
fragments. I’m using a hand crafted VB.net wrapper which explains some of the
syntax
Private WGS84SRS As New OGRSpatialReference ' Coordinate system in WGS84
Private MapSRS As OGRSpatialReference ' Coordinate
I have a GIS database with all coordinates stored in WGS84 datum. I am
trying to translate the coordinates of the database to the datum of my map.
I am creating two OGRSpatialReference, one for WGS84 and one for the current
map. I am then creating an OGRCoordinateTransformation. When I do so I get
Expected result was a UTMeast >0 . I always receive the same result no
matter the input.
-Original Message-
From: gdal-dev-boun...@lists.osgeo.org
[mailto:gdal-dev-boun...@lists.osgeo.org] On Behalf Of Jean-Claude Repetto
jrepetto-at-free.fr |GDAL|
Sent: Saturday, September 24, 2011 11:15
Sorry - left critical line out of previous post. Is there a web based
version of this mailing list? It's a bit tedious with mailman.
Can anybody see what I'm doing wrong (and don't say writing it in VB.NET) in
my logic of converting a Lat/Long to UTM? All the assignments, except the
lat one, ar
Can anybody see what I'm doing wrong (and don't say writing it in VB.NET) in
my logic of converting a Lat/Long to UTM?
Dim MapSRS As New OGRSpatialReference ' Coordinate system of map
Dim UTMSRS As New OGRSpatialReference ' Coordinate system for UTM
Dim CT As OGRCoordinat
1. I am attempting to build GDAL with the OziExplorer file format
(ozf2/ozxf3) driver. I have downloaded the source from
http://download.osgeo.org/gdal/gdal181.zip and successfully built GDAL using
VC Express 2010. I cannot see the source files for the ozf2/ozxf3 files
driver. Where would I find th
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