Hi
I am adding write support for the Northwood Grid (Vertical Mapper/MapInfo
format) driver.
This format only allows 32 bit float as the datatype, and to make things
more tricky it actually stores this on disk as either 16 or 32 bit ints,
using scaling rules.
The current read driver applies the s
Le mardi 12 avril 2016 17:10:41, jramm a écrit :
> Hi
> I am adding write support for the Northwood Grid (Vertical Mapper/MapInfo
> format) driver.
> This format only allows 32 bit float as the datatype, and to make things
> more tricky it actually stores this on disk as either 16 or 32 bit ints,
>
Hi
I have implemented the write support in the NWT_GRD format, having to make a
few compromises. I'd like to go through them and see if they are reasonable.
I have also attached the diff.
1. The existing read driver reports 4 bands for a GRD dataset. The first 3
are essentially 'virtual' - they ar
Le lundi 18 avril 2016 10:51:06, jramm a écrit :
> Hi
> I have implemented the write support in the NWT_GRD format, having to make
> a few compromises. I'd like to go through them and see if they are
> reasonable. I have also attached the diff.
>
> 1. The existing read driver reports 4 bands for a
Even Rouault-2 wrote
> Skimming through the code, it seems you must provide zmin / zmax to do the
> scaling of floating point elevations to integral values. So either it is
> user
> provided, or you do a prior statistics computation in CreateCopy() if the
> input dataset hasn't min/max metadata.
Le mardi 19 avril 2016 11:22:50, jramm a écrit :
> Even Rouault-2 wrote
>
> > Skimming through the code, it seems you must provide zmin / zmax to do
> > the scaling of floating point elevations to integral values. So either
> > it is user
> > provided, or you do a prior statistics computation in C
As an update to this; I have finished write support for the GRD driver for
now, with ZMAX/ZMIN exposed as creation options and will be explicitly
calculated in CreateCopy if not passed in - exactly as you suggested Even,
thanks.
I'm waiting permission to get a osgeo user id so I can raise a ticke
