geotiff

[Anonymous]

i can't find any where in the help for autocad that autocad supports geotiff files or if it does, how to insert them. i know how to insert a regular tif file as long as the coordinates are supplied but geotiff files have the coordinates embedded in them and come with no read me file that has the coordinates. Any clues?
mh

[Anonymous]

mike-herman wrote:

> can't find any where in the help for autocad that autocad supports
> geotiff files or if it does, how to insert them.

Vanilla can't do it, AutoCAD Map (or CAD Overlay with Vanilla) can.

Terry

[Anonymous]

Terry,
I moved into acad map, followed the insertion procedure, (image, insert...left "modify correlation' unchecked) and it placed the image at 0,0,0 (which is the wrong place). So...would you assume that this image has incorrect geo info or that i'm doing something wrong?
mh

[Anonymous]

Mike,

Can you post the image to customer-files? I can take a look.

Thanks,
--
Sriram Gopalakrishnan
Autodesk Design Solutions Division
(Remove no-sp-am from email for reply)

[Anonymous]

Sriram,
I would but I'm guessing it might be a little over the file size limit since it weighs in at 170 megs. It is a rather large aerial photo.
mh

[Anonymous]

Mike.  What kind of world referenceing file is
with the TIF?  Map has a problem with reading a HDR referecing file, but
can read a TFW.  If you download a program called GeoTiff Examiner from
Mentorsoftwareinc.com, it will read the GEOTIFF and then creates a TFW
file.  You them insert the image using the MAP => Image => Insert
command.

I too can not get Map to read the
GEOTIF.

style="BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">

mike-herman <
href="mailto:mherman@hunsakersd.com">mherman@hunsakersd.com> wrote in
message
href="news:f05c397.3@WebX.maYIadrTaRb">news:f05c397.3@WebX.maYIadrTaRb...

Sriram,

I would but I'm guessing it might be a little over the file size limit
since it weighs in at 170 megs. It is a rather large aerial photo.

mh

[Anonymous]

Mike,

How much is it zipped up? Can you zip it and email it to me?

Thanks,
--
Sriram Gopalakrishnan
Autodesk Design Solutions Division
(Remove no-sp-am from email for reply)

[Anonymous]

Sriram,
It's 153 megs zipped. I don't really think your e-mail provider would accept it nor our provider. thanks for the thought though.
mh

[Anonymous]

Kieth,
Thanks for the tip. I'll give it a try. The tech guy who made the file at the aerial photobank is on vacation till monday and no one else there knows anything so i don't know what kind of referencing it is.
mh

[Anonymous]

Kieth,
That was an interesting exercise. The file is not geo referenced (according to the mentor software). That would explain why it comes in at 0,0,0. I've put a call into the company that sent the file to us. probably won't know anything till the tech guy gets in from vacation on monday though. thanks again for the heads up.
mh

[Anonymous]

Hi Mike.  Like I mentioned before, even if out
TIF images are georeferenced, I can not get MAP to read these in WITHOUT some
kind of worls refercing file like a TFW.  If Sriram is still out there
reading this post and knows how to do this, I'd sure like to know!

Hope you get it figured out.

Keith

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mike-herman <
href="mailto:mherman@hunsakersd.com">mherman@hunsakersd.com> wrote in
message
href="news:f05c397.8@WebX.maYIadrTaRb">news:f05c397.8@WebX.maYIadrTaRb...

Kieth,

That was an interesting exercise. The file is not geo referenced
(according to the mentor software). That would explain why it comes in at
0,0,0. I've put a call into the company that sent the file to us. probably
won't know anything till the tech guy gets in from vacation on monday though.
thanks again for the heads up.
mh

[Anonymous]

Keith,

Map *can* read the geo-referencing information in a GeoTIFF file. You
mentioned something about an HDR file. HDR files typically aren't associated
with a TIFF. So if you are expecting geo-referencing information from an HDR
file to be read in with a TIFF, Map will not do that. And a TIFF+HDR is not
GeoTIFF.

Having said that, there might be GeoTIFF files that Map is not reading
correctly. In which case, I would definitely like a copy of the file since
Im not aware of any such issues. Either post to customer-files or email it
to me - zip it up if possible. At the very least, I can get it logged as a
defect for a possible fix in the future.

--
Sriram Gopalakrishnan
Autodesk Design Solutions Division
(Remove no-sp-am from email for reply)

[Anonymous]

Mike,

Our email can handle it I believe. If you can't email it, can you ftp it to
some location?

Thanks,
--
Sriram Gopalakrishnan
Autodesk Design Solutions Division
(Remove no-sp-am from email for reply)

[Anonymous]

Then briefly explain what the actual GeoTIFF is then. From what I understand, the georeferencing is embedded into the TIFF thus you have a GeoTIFF. Am I right?

HDR files are associated with a TIFF. We buy DOQQs from USGS EROS and the TIFF files have an HDR file with them. R14 could read the HDR file, but A2K and above can not read it, I have to have a TFW. Bad choice for Autodesk to remove the HDR readability.

If you can respond here and give me your email and I can send a sample TIFF that is georeferenced directly to you. It is 3.3 MB zipped. Or you can email me at k_kempker.removethis@bartwest.com remove the "removethis" to email me.

Cheers.

Keith

[Anonymous]

Keith,

Your understanding is correct. I believe the USGS might have distributed HDR
files with GeoTIFF's for easy lookup of the geo-referencing information (the
information in the TIFF file can be difficult to lookup since its a binary
file).

There was a problem with GeoTIFF files encoded in 'big-endian' or Motorola
format in Map R4 (Release 2000) which was a regression from Map R3 (R14).
This is probably what you are seeing. This doesn't have anything to do with
the HDR's. This problem was fixed in Map R4.5.

HTH,
--
Sriram Gopalakrishnan
Autodesk Design Solutions Division
(Remove no-sp-am from email for reply)


"keithk" wrote in message
news:f05c397.12@WebX.maYIadrTaRb...
> Then briefly explain what the actual GeoTIFF is then. From what I
understand, the georeferencing is embedded into the TIFF thus you have a
GeoTIFF. Am I right?
> HDR files are associated with a TIFF. We buy DOQQs from USGS EROS and the
TIFF files have an HDR file with them. R14 could read the HDR file, but A2K
and above can not read it, I have to have a TFW. Bad choice for Autodesk to
remove the HDR readability.
>
> If you can respond here and give me your email and I can send a sample
TIFF that is georeferenced directly to you. It is 3.3 MB zipped. Or you can
email me at k_kempker.removethis@bartwest.com remove the "removethis" to
email me.
>
> Cheers.
>
> Keith
>
>