Where features overlap
5
votes
1answer
284 views
Apportioning Points at a street intersection (arcgis or mapinfo)
I can't seem to find any evidence of this question, but I'm surprised by that, so pardon if this has been asked.
If one is mapping crime location reports, by XY coordinates to streets, to create ...
2
votes
1answer
69 views
How to efficiently check for feature overlaps with Arcpy?
In an effort to reduce processing time, I am looking for ways to pre-process data within my script. I have ~18,000 featureclasses with ~500 features each (all simple circle polygons) from which I want ...
2
votes
1answer
144 views
Intersection of drawn polygon with WMS layer features. Better of two methods?
Scenario:
Several WMS layers with polygon features.
Objective:
Draw a polygon with OpenLayers and allow it only if doesn't not cut any features in WMS layer. It can contain the features as a whole ...
1
vote
1answer
15 views
Intersection with JTS Geometry
I want to calculate an intersection between two geometries with the intersection function from JTS Geometry.
What happens, if the geometries have different SRIDs?
SimpleFeature sf1=...; //SRID ...
0
votes
1answer
45 views
Rhumb lines intersection
I looking for algorithm how to find out whether two rhumb lines given by point1 with azimuth1 and point2 with azimuth2 have intersecting point. Have anyone idea how to find intersection ?
For ...
3
votes
0answers
126 views
Rgeos drops associated values when intersecting polygons
I am trying to intersect two SpatialPolygonsDataFrames and get a SpatialPolygonsDataFrame as the result. Unfortunately, using the gIntersection function from rgeos (which works impressively quickly ...
3
votes
0answers
392 views
How to find all intersections and count lines arriving at each intersection?
I'm having a hard time getting off the ground with this, and am trying to move away from ArcGIS / arcpy.
I have a shapefile with a network of polylines. I want to find/count all 2-way intersections, ...
2
votes
0answers
335 views
cant find point/polygon intersect using qgis (windows only)
below i describe the method i am using.
i have 2 machines: 1 ubuntu linux, qgis 1.4 - intersection works
2 WIN xp, qgis 1.8 - intersection dows not work
hopefully, someone will ...
1
vote
0answers
65 views
intersect two shape files using QGIS API
I am trying to automate a process of a shape file. We are using google maps engine and we have limitation on number vertices in a shape file. so I am using a grid to split the shape files.
In GUI , I ...
1
vote
0answers
26 views
Suggestions for vector format for polygons
I am using two polygon tables in postgis (A and B ).
I need to make a vector file that incorporates information of the overlapped polygons B intersecting each polygon on (A).
I can make a single ...
1
vote
0answers
78 views
How to handle/ avoid intersect errors when clipping the difference between two layers?
Using QGIS + Grass, I've added a shapefile of coastline and islands to my map.
I then buffer this shapefile to create a coastal zone of a known width. At this stage the buffer consists of the ...
1
vote
0answers
111 views
How could I make this PostGIS query run faster?
SELECT st_band(rast, 1), st_width(rast), st_height(rast),
st_bandpixeltype(rast, 1), st_bandnodatavalue(rast, 1),
st_scalex(rast), st_scaley(rast), st_upperleftx(rast),
st_upperlefty(rast) FROM ...
1
vote
0answers
152 views
error in gp.execute intersect
i generate a tool to return values using area of polygons. but when i execute the tool, visual studio show an error :"Error HRESULT E_FAIL has been returned from a call to a COM component" in ...
1
vote
0answers
99 views
Copied points not intersecting the original points
I'm using an arcpy search cursor to access a Oracle database. I have a simple Python class that I copy the returned row objects into, which gives me more flexiblity than the cursor.
The problem is ...
0
votes
0answers
22 views
GEOS: How to intersect without noding?
As discussed in this question intersecting two GEOS line geometries gives a result which has also been noded.
This is very nice if noding is what you want, but is it possible (through the C api) to ...
0
votes
0answers
30 views
Slicing / Cutting a Polygon / Polygon List based on another geometry
I currently use GeoDjango (GEOS, GDAL, PROJ4), I have rather medium set of polygon data (buildings).
To streamline them to a client efficiently (client has a limited viewport) I only want to send the ...
0
votes
0answers
72 views
How to insert vertex in polyline layer where we have a point in a point layer
I have a polyline layer and a point layer. Some of the points are on the polylines, but the polylines do not have vertex in these points.
How can i insert vertex there ?
