Yilmaz Arslanoglu wrote:
Hi;
I am trying to build and install the GDAL library on Windows XP
using the following commands:
nmake /f makefile.vc
nmake /f makefile.vc install
nmake /f makefile.vc devinstall
In order to build with GEOS support, I uncommented the lines
in the "nmake.opt" as follows:
GEOS_DIR=C:\geos-3.1.1
GEOS_CFLAGS = -I$(GEOS_DIR)/capi -I$(GEOS_DIR)/source/headers -DHAVE_GEOS
GEOS_LIB = $(GEOS_DIR)/source/geos_c_i.lib
However, I still get the same .dll and .lib files as if no GEOS
support was turned on
Yilmaz,
Make sure you do a "nmake /f makefile.vc clean" after any change to
the nmake.opt file. The makefiles are not setup to force a full
rebuild on changes to the nmake.opt file or sub-makefiles.
2) I was also wondering whether OGR library provides a kind of nearest
neighbour finding facilities?
If not, does anybody know any library that could be integrated with
OGR for this purpose?
I plan to use it to find the n nearest sounding points (SOUNDG)
given a point, to make a prediction
about its depth.
Nothing comes to mind to address this.
3) Finally, is there any facility in OGR for querying a layer such that
it will only return the features on it, which contain a given
point as parameter?
Because I could not come up with an SQL statement to perform this task.
Actually I was planning to use this on the DEPARE (depth area) layer on
an S-57 file to find the depth area polygon that covers the given point.
If you specify a point to OGRLayer::SetSpatialFilter() you should only
get back features that intersect that point. Without GEOS you would get
any feature whose bounding box contained that point but with GEOS the
test should be more precise.
Best regards,
--
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I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com
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and watch the world go round - Rush | Geospatial Programmer for Rent
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