[Geotiff] How can users participate in additions to the current GeoTIFF spec leading to the next official specification?

[Nagle, Gail A (US SSA)]

As a member of the GeoTIFF user community, I am wondering how the next
version of GeoTIFF will be adopted.

If the plan is not to stop at v1.0, how can users participate in the
adoption of standard geokeys for the next version of the GeoTIFF spec?

 

I have seen several threads related to the use of GeoTIFF to store DEMs.
In fact one of them was mine!

It seems that GeoTIFF is an ideal format for representing DEMs, but
currently it has some shortcomings

unless non-standard private keys are used. The use of private keys
limits the general utility of storing data this way.

 

We are using 4 private keys in the 32000 - 33000 range to tag values for
overall absolute horizontal accuracy, absolute vertical accuracy,
relative horizontal accuracy and relative vertical accuracy for a DEM
stored as GeoTIFF. These are the same values stored in a DTED format
file as defined in MIL-PRF-89020B, "PERFORMANCE SPECIFICATION DIGITAL
TERRAIN ELEVATION DATA (DTED)"
http://earth-info.nga.mil/publications/specs/printed/89020B/89020B.pdf

(See section 6.4.1 a, b, c, d on page 37).

 

We are interested in participating in the process which could lead to
having these 4 keys officially adopted as part of the new spec. 

 

We have seen a draft spec calling itself version 1.5 which may have
originated at JPL. But still this spec is incomplete, having provided
for only 2 accuracy values.

 

Hopefully, others trying to store DEMs in GeoTIFF format will express a
similar interest in the additions needed to establish a standard set of
geokeys for easy interchange of DEM data.

 

Best regards,

Gail Nagle

BAE Systems

San Diego

 

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