|
|
| GeoCommunity Mailing List |
| |
| Mailing List Archives |
| Subject: | Re: GISList: de facto standards |
| Date: |
08/04/2003 02:35:01 PM |
| From: |
viktoras |
|
|
Hi Frank,=0D
=0D
What I do is a high resolution bathymetry map of a lake from sound-scanning
data.=0D
My contractor wants all data to be delivered in MapInfo compatible formats.=
=0D
And I don't have MapInfo in my workplace :-)=0D
=0D
I am going to use GeoTIFF format for the final map:=0D
vector isobathes with their atributes (depth in meters) will be exported to
MIF/MID:=0D
(By the way - are there any "user-editable ASCII vector" formats suitable
for this purpose ? )=0D
And create a raster (DEM) for interpolated depths' raster.=0D
Projection: UTM.=0D
=0D
Please, let me know if I am wrong. Thanks in advance.=0D
=0D
Best regards=0D
Viktoras=0D
=0D
-------Original Message-------=0D
=0D
From: Frank Warmerdam=0D
Date: 2003 m. rugpj=FBtis 02 d. 19:06:03=0D
To: viktoras=0D
Cc: gislist@geocomm.com=0D
Subject: Re: GISList: de facto standards=0D
=0D
You haven't provided much in the way of constraints on this request.=0D
=0D
If you are looking for current formats for raster and vector data that are=
=0D
widely supported in GIS applications I would suggest Shapefiles for vector=
=0D
and GeoTIFF for raster. Both are very widely supported (though to varying=
=0D
degrees), and reasonably compact binary formats.=0D
=0D
There are some data model limitations of these formats, especially for
shapefiles.=0D
For instance, each shapefile set must have only one geometry type (arc,
polygon,=0D
point) and shapefiles use dbf files for attributes which can only have shor=
t=0D
field names (11 characters long at most?). Coordinate system support in=0D
applications reading shapefiles will vary, with most ignoring shapefile=0D
.prj files which may take two forms, Arc/Info 7.x format and ArcGIS format=
=0D
(an ESRI specific form of OpenGIS Well Known Text). Also, shapefiles carry
no=0D
presentation information, so it is good for transporting raw GIS layers, but
not=0D
final map presentations or CAD drawings with complex drawing characteristics
=0D
Shapefiles make a good lowest common denominator format, but if you have a=
=0D
sophisticated data model it may be hard to provide it in shapefile format.=
=0D
=0D
GeoTIFF has pretty good coordinate system support, but for some many=0D
applications will ignore the coordinate system and only pick up the=0D
georeferencing coordinates. In general TIFF and GeoTIFF are quite flexible,=
=0D
but the more esoteric the options you use the less applications that will=
=0D
support the files properly.=0D
=0D
My opinion of course, your milage may vary ... better advice can be provide=
d=0D
if you give more specific requirements.=0D
=0D
Best regards,=0D
=0D
-- =0D
---------------------------------------+-----------------------------------=
--
=0D
I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com=
=0D
light and sound - activate the windows | http://pobox.com/~warmerdam=0D
and watch the world go round - Rush | Geospatial Programmer for Rent=0D
=0D
=20
To unsubscribe, write to gislist-unsubscribe@geocomm.com
________________________________________________________________________
GeoCommunity GeoBids - less than $1 per day!
Get Access to the latest GIS & Geospatial Industry RFPs and bids
http://www.geobids.com
Online Archive of GISList (and numerous others) available at:
http://spatialnews.geocomm.com/community/lists/
Setup a GeoCommunity Account and have access to
the GISDataDepot DRG & DOQQ Catalog
http://www.geocomm.com/login.php
|
|
Sponsored by:
For information
regarding
advertising rates
Click Here!
|
