I've just been following this board long enough to have seen others ask the
same. Ah, spherical trig... .
Best,
Steve
On Feb 19, 2013, at 12:07 PM, "Jensen, Layne K CIV SPAWARSYSCEN-PACIFIC, 56210"
mailto:layne.jen...@navy.mil>> wrote:
Steve,
Of course, you're absolutely correct. I knew t
Thank you very much for the explanations.
Indeed, with a St_Value, I can assess that the request worked, but without
opening the result in ArcGIS (its plant), this notice message make me doubt.
Samy
2013/2/20 dustymugs
> The only problem you have in your query is the expression being provided
>
The only problem you have in your query is the expression being provided
to ST_MapAlgebraExpr(). That expression should be:
[rast1.val]*[rast2.val]
The notice itself can safely be ignored. In the normal use case, your
source rasters are tiled into smaller chucks. And between these smaller
chuc
Hello everybody,
I'm trying to test the St_MapAlgebraExpr 2 raster version in order to
multiply the values of a raster by the values of an other one.
Here is the request :
SELECT St_MapAlgebraExpr(a.rast,b.rast,'(a.rast*b.rast)::double
precision','32BF','INTERSECTION','NULL','NULL',-1) As rast
F
On 2/19/2013 12:35 PM, Jonatan Malaver wrote:
Hello,
Let's say I have 3 parcel centroids with one feature in common. How
would I do a trace back to the common feature between those points?
Also, how can I do a flood analysis?
Thanks,
Jonatan Malaver
Assistant Engineer of Electrical and Ca
Let me give you more info. I'm trying to sync my GIS with our outage management
system (small electric utility). I would like to trace back an outage call
(customer points) to a common transformer (point), fuse (point), or station
(point). All the points are in different tables, and they are all
On 2/19/2013 12:35 PM, Jonatan Malaver wrote:
Hello,
Let’s say I have 3 parcel centroids with one feature in common. How
would I do a trace back to the common feature between those points?
Also, how can I do a flood analysis?
Thanks,
Jonatan Malaver
Assistant Engineer of Electrical and Cab
Hello,
Let's say I have 3 parcel centroids with one feature in common. How would I
do a trace back to the common feature between those points? Also, how can I do
a flood analysis?
Thanks,
Jonatan Malaver
Assistant Engineer of Electrical and Cable Operations
Shrewsbury Electric & Cable Operat
Steve,
Of course, you're absolutely correct. I knew there had to be a great big
"Duh!" in there somewhere, and was prepared to be embarrassed. I hadn't
visualized the polygon as a series of great circles. Thank you for bringing me
back to reality.
Layne
From: Stephen V. Mather
Sent: Tue
Having not looked at your particular use case in detail, my guess is it's
related to the world not being flat, see e.g.:
http://blog.opengeo.org/2012/04/30/the-earth-is-not-flat-volume-2/
Best,
Steve
[http://sig.cmparks.net/cmp-ms-90x122.png] Stephen V. Mather
GIS Manager
(216) 635-3243 (Work)
We are using PostgreSQL version 9.2.2 with PostGIS 2.0,and need to do simple
queries to find points that are within or intersect with a polygon.
The following test case returns only partial results for an unknown reason. If
the minimum longitude value of the polygon is changed from 0 to 1 to 2 t
Hi,
I have a problem with my geography type query. The query is set up to
calculate the area of every intersection between a regular grid (.5x.5
decimal degrees) and a polygon shapefile for Africa.
However, I run into problems. I have checked both the grid geometry and the
polygon geometry, and bo
Hello list,
While executing old scripts today I noticed that the behavior of the function
ST_PointN has changed between postgis 1.5 and 2.0
When the function is used on a MULTILINESTRING the behavior is not the same and
it looks like a bug in 2.0 I think.
The doc says :
""ST_PointN - Return th
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