[UW-GIS-L] Trouble bringing all shapfile features into SDE

[Luke Rogers]

ArcSDE stores coordinates as long integers (32-bit) which gives you 9 digits
to store coordinate geometry. If your data is in decimal degrees and you are
on the equator where 1 degree ~ 111,111 meters then the difference between
123.456788 and 123.456789 is about 95 centimeters. So, if you are storing a
global dataset in ArcSDE then the maximum resolution of the data is about 1
meter, if my math is correct. If you store global data in meters then you
get about a 4 cm resolution?

This is why false eastings and northings and geographic extents (XY domains)
are so important. Those get added to the stored integers to give you real
world coordinates. The smaller the geographic area, the more precise ArcSDE
can store data.

But no matter what you do in ArcSDE, you can't to an inch on a global scale.

-Luke 

-----Original Message-----
From: uw-gis-l-bounces at mailman1.u.washington.edu
[mailto:uw-gis-l-bounces at mailman1.u.washington.edu] On Behalf Of Harvey
Greenberg
Sent: Monday, May 22, 2006 3:03 PM
To: UW - GIS Discussion & Support
Subject: [UW-GIS-L] Trouble bringing all shapfile features into SDE

Short version: I try to import shapefiles into an SDE (Spatial Data
Engine) Dataset, and some (more complicated?) features fail to import,
saying something like:
"Input feature 3 fails when inserting its geometry."

Long version:
I downloaded the twelve thousand one-degree tiles of the SRTM-based world
waterbody dataset.  They are 3D (really 2D) shapefiles, and will not import
with the command-line shapearc command.  After several false starts, I
constructed a series of ArcGIS commandline merge commands to merge them into
4 huge shapefiles.  Now I want them in SDE so that I can serve them to all
of you.  When I import them as a feature class in a feature dataset
(FeatureClassToFeatureClass), many features fail to import.  They seem to
include some rivers and the more complicated 
shorelines.   The problem occurs even when I import a single small 
tile.  I seem to lose the fewest features when I set my XYDomain with a
scale of 3600. (The data is 1" resolution.)  Is SDE simply incapable of
supporting complicated polygons?

harvey

-- 
hgreen at u.washington.edu  374 Johnson Hall 206-685-7981	
http://gis.ess.washington.edu/

	Harvey Greenberg
	University of Washington
	Department of Earth and Space Sciences
	Box 351310
	Seattle WA 98195-1310

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