(1) abstract geometry; (2) storing geographic data in projected coordinates; (3) a generic ESRI term for vector features; a class for "geometry" objects.
3
votes
3answers
140 views
What Application for Vector and Cartesian Coordinate System
Goal:
Visualize a picture in SQL server 2012 spatial data based on geometry
Problem:
In order to display a vector picture I need to retrieve X, Y coordinate (cartesian coordinate system) and ...
3
votes
1answer
75 views
How can i topologically sort 2D triangles and put in an array?
I have a set of 2D triangles in a Geometry array which together forms a
connected strip when placed them according to edge adjacency. However, in
the array they are not in topological order based on ...
1
vote
1answer
16 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 ...
1
vote
1answer
46 views
Calculating area
I have a polygon layer.
I toggled to edit mode.
I added a new column, while number (integer) and called it "area".
I then use the field calculator - geometry - $area to populate the polygon area for ...
1
vote
1answer
31 views
Merge Multipart Feature Line
I'd try to merge multipart feature line, but didn't work.
would you please teach me how to merge multipart feature line?
I work in version environmental and geometry network.
Regards,
0
votes
1answer
14 views
How to fix buffer selection issue in ESRI ArcGIS Javascript API and LGIM applications
I had strange LGIM application behavior where the map spatial search did not highlighted the parcels within the Geometry Buffer. What could be the possible reasons?
LGIM stands for the Local ...
0
votes
1answer
58 views
ST-Links convert Feature Class to DB Table error
I'm using ArcMap with the ST-Links SpatialKit Conversion tool to convert a Feature Class to a DB Table. But I'm getting an error: ERROR: 42601: type modifier is not allowed for type "geometry".
I ...
0
votes
1answer
53 views
Is it possible to have measurements in centimeter and decimeter in 2D flat (geometry)?
Is it possible to have measurements in centimeter and decimeter in 2D flat (geometry) for ArcGIS?
15
votes
0answers
361 views
Space filling between random 2D lines
Consider a region (2D) filled with lines randomly (following Figure). We are interested in filling the empty spaces between lines including four boundary edges in a way:
0- maximizing the size of ...
5
votes
0answers
79 views
How to find the maximum-area-rectangle inside a convex polygon?
In this post we are looking for algorithms / ideas on how to find the maximum-area-rectangle inside a convex polygon.
In the following figure, numbers are the areas of the fitted rectangles. As shown ...
5
votes
0answers
98 views
Why do file geodatabase and SDE readers produce different fme_geometry types?
I have one very simple workbench that I am running against both SDE (9.3) and FGDB (10.0) sources.
I noticed two different fme_geometry values for same type of objects.
For the first one, i.e SDE ...
4
votes
0answers
207 views
IFeatureClass.Search throws error “0x80041599 The number of points is less than required for feature”
I am creating a buffered geometry around a point feature in order to search for other nearby features. I use the TopologicalOperator to create my buffered geometry. I am attempting to search a feature ...
4
votes
0answers
472 views
OpenLayers: WFS request to GeoServer to retrieve “name” & “featureNS”
Using WFSGetCapabilities I sent a GetCapabilities request to GeoServer. From the result of WFSGetCapabilities().read(), I can loop each featureType and retrieve some basic info(e.g., name, title, ...
2
votes
0answers
35 views
What traits identify 2D, 2.5D, 3D geometries, and how can you convert downward, such as from 25D to 2D?
In answering this question, posed by @Burton449, I came to realize I don't have a definitive grasp on what distinguishes 2D, 2.5D, and 3D geometries. I certainly realize Z/elevation values are ...
2
votes
0answers
56 views
Which is better for storage? Geometry column or varchar?
Objective:
Need to store and retrieve a list of geometries from the database. Basically these are drawn by the user using OpenLayers which I would like to save and present again as a list (kind of ...
2
votes
0answers
30 views
Find gap in / endpoints of linestring
I have a set of features of type linestring. I'm trying to polygonise the linestrings and assumed that they were closed (naive me :) ). Of course some were not closed and I'm trying to locate the gaps ...
2
votes
0answers
53 views
Critera for geometry or geography
What criteria do you need to take account to before you choose geometry or geography map?
Is there a book or page about it?
2
votes
0answers
86 views
how to convert lat and longitude into distance near poles?
I am trying to convert latitude and longitude into meters in polar regions. I am looking for higher accuracy upto 0.00 meters preferably. I tried the haversine formula but it doesnt seem to be ...
1
vote
0answers
46 views
Retrieving ArcGIS:s Spatial Data into a Database
Background:
If you have created a vector map with lots of spatial data in geometry flat in with measurement kilometer. The following object that is used in the map will be point, line and polygon ...
1
vote
0answers
62 views
Programmatically change geometry column in OpenLayers WFS layer
is there a way to programmatically change the geometry column on which a WFS layer is based and displayed?
WFS (from GeoServer) is correctly returning me two geometry columns, I want to change "on ...
1
vote
0answers
53 views
Geoprocessing operations re-introduce geometry errors after “repair geometry” succeeds
I am working with a shapefile that has many small, detailed polygons. After exporting it to a feature class in a geodatabase, I found that some operations (for example, Snap in the Editing Toolbox) ...
1
vote
0answers
82 views
Calculating spaces between roads from PostGIS database
Is it possible to calculate the spaces between the roads using a select statement in a PostGIS/PostGre Database? I tried using some combinations of the predefined functions as ST_Intersects & ...
1
vote
0answers
180 views
ArcGIS/arcpy: Geometry object comparison methods not working. Do they take z values into account?
I have an arcpy script that makes calculations based on an input PolygonZ feature class. What I need to do in several places in the script is test whether a point falls within a polygon in 2D. In ...
1
vote
0answers
178 views
Create IPoint with Lat/Long in decimal degrees and Z in feet
I have written an ArcMap v10 AddIn that reads a folder of geotagged JPEG's and creates a new feature class where each point is the geotag information from on of the JPEG's. The issue is:
The GPS ...
1
vote
0answers
173 views
Problems with Multipatches
I have some polygonal features that have minimum and maximum z values.
I'm trying to calculate the difference between a fixed extruded polygons and the sum of extruded related polygons.
Here's how ...
1
vote
0answers
429 views
ArcGIS 10.0/arcpy: Can't retrieve the points in a polyline geometry obect: any idea why?
My arcpy script builds a Python dictionary, dictCLPnts, that holds the geometry objects of a polyline feature class. The following code snippet shows the attempt to access the geometry object with ...
1
vote
0answers
237 views
export topology tables to txt files using arcobjects, generating directed graph , finding intersections
I want to export topology tables to text files:
for points:
1 id x y
for lines:
line id fompoint.x from point.y topoint.x topoint.y
for polygons:
id line id 1, line id 2...
2 arc ...
0
votes
0answers
26 views
Python GDAL/OGR: check lines geometries connectivity
I'm working with shapefiles representing roads, so basically it's stored as (poly)lines.
I need to perform a road connectivity checking. In other words, I want to ensure that roads meant to ...
0
votes
0answers
27 views
How to modify the coordinates of a SHP geometry using Geotools?
I have a shapefile with some polygons. I would like to change the height for this elements using Java. The rest of the attributes should be the same. I've thought using GeoTools but I haven't found ...
0
votes
0answers
27 views
How to populate polygon extents to an attribute table in QGIS
Is there a way to calculate the XMIN, YMIN, XMAX and YMAX of a polygon and write it to a field in an attribute table? The Geometry functions available in the Field Calculator are for points.
...
0
votes
0answers
49 views
Entity with Geometry column to JSON with Java / RestEasy / Jackson
How can I transform a entity with geometry column in a JSON to send via RESTEasy?
Thanks, Luciano
0
votes
0answers
132 views
Why has MultiPolygon been deprecated in GML 3.0?
As stated in the title: Why has MultiPolygon been deprecated in GML 3.0? Was this an arbitrary decision?
From OpenGIS Geography Markup Language (GML) Encoding Specification (02-023r4)
A ...
0
votes
0answers
93 views
How to migrate data from PowerBuilder Sybase to Spatialite
I want to send data for points and lines from Sybase to DotSpatial project using SpatiaLite.
ODBC connection between PowerBulder 11.5 Sybase SQL and SpatiaLite SQL works OK except for inserting or ...
