Related to or existing within space.
1
vote
1answer
48 views
How do I know the cause of my spatial error?
A (probably?) very basic question about spatial error it's about time I knew how to think about and answer correctly.
I have some data plotted from XY coordinates. I look at them and it turns out ...
2
votes
0answers
20 views
Is there a way to find the closest anticorrelated polygon or automate what is learned in the semivariogram?
I am trying to do spatial autocorrelation of sorts based on a layer of polygons of mean rainfall data. I want to see how rainfall deviates from a certain point on the landscape. Essentially, I want to ...
0
votes
2answers
23 views
ShapeFile with Z Co-ordinates
I have 3 shapefiles, two of them wihtout the Z Co-ordinates elevation but 1 of them has a Z co-ordinate elevation. I can load two ShapeFiles into my SQL Server Database which does not have Z ...
1
vote
2answers
35 views
Fastest way to join points table to polygons tables in ORACLE
I have two tables in 11g oracle db, one with points geometry, one with polygons. Currently I need to enrich the points table daily with the name of the polygon (country) that the point is inside, but ...
4
votes
1answer
29 views
Spatial Analysis - Identifying Regions with Common Boundaries
I have the shape file for DC PSA's as defined in 2012 (see below). I would like to be able to identify in semi-automatic fashion which PSA's are neighbors - that is, which PSA's are nearest neighbors ...
0
votes
1answer
84 views
PHP/MySQL, PostgreSQL spatial queries. Find a polygon that contains a coordinate? [closed]
I am building a non mapping javascript app and I am wanting to take a lat/long coordinate and query a MySQL table of polygons for the one that contains the point.
I have looked into MySQL spatial ...
1
vote
1answer
45 views
How to select a part of a land cover type a certain amount of feet away from another land cover type
I have raster Landcover type Urban combined with Forest all within the county raster perimeter. I want to make a layer of only the forest cells that are more than 500 feet from an urban cell, so that ...
2
votes
1answer
57 views
Fast Custering Algorithm for Geographic Data
I have been browsing through the net in my attempt to find a fast clustering algorithm to cluster geographic points, but lot many of the results found were for clustering algorithm in general and not ...
3
votes
2answers
114 views
Similarity between two raster maps
Having two raster maps as the examples below:
We are interested in evaluating their similarities. As shown, they are not fully overlapping. We guess one way is to clip small one area from the ...
0
votes
0answers
37 views
OpenLayers Mapserver spatial filter INTERSECTS format problems
Trying to get hand-drawn polygon delimiter for spatial query via OpenLayers to mapserver (then postgis). I can get the WKT of the drawn polygon and can substitute the dynamic values, but am having ...
0
votes
0answers
38 views
How to drill down through multiple polygons/points in QGIS?
I have a layer that has multiple polygons sitting on top of each other, is there a way to easily scroll through those polygons that overlap each other?
Thanks
1
vote
1answer
21 views
How to get a centroid of a closed line in MYSQL
I have a table that contains only closed lines (lines where endpoint is the same as startpoint).
I would need to find a centroid for those lines. How would I be able to achieve it?
It does not ...
2
votes
1answer
56 views
How to work with flt & hdr files
I have been working on a vector-based spatial analysis in R using shapefiles.
I wish to use some environmental data that is downloadable, however it is only available in raster format (FLT & HDR ...
1
vote
2answers
91 views
spatial query st_contains postgis
This seems too simple to be asking this but I am really new to postgis/postgres have been going around in circles with this. I am performing a really simple spatial query where I would like to make a ...
1
vote
0answers
37 views
Determining homogenous blocks of individual tree species in a woodland, and creating a new shapefile without blocks/polygons of < minimum area?
I'm working on a project attempting to identify suitable woodland habitat for red squirrel translocation wherein conservation efforts could be focused. Below is a small section of the map showing ...
0
votes
0answers
62 views
SQL Spatial: MakeValid() splits a polygon into 3 separate polygons
I am trying to import one of the EPSG (http://www.epsg-registry.org/) area polygons (the polygon with area code 1999) into SQL Spatial. The polygon is in GML format and covers the southern hemisphere ...
3
votes
1answer
169 views
How to split a polygon using R
I have an irregular polygon (see here), which is a spatial object. I want to divide it into multiple polygons (say, n=25) with equal height. To show how I want to divide it, I've plotted grids on the ...
1
vote
0answers
39 views
ArcMap vertex problem for Z-value
I have an Oracle Spatial dataset with z-coords. I can edit the dataset in ArcMap however the z-values are always rounded to the nearest integer.
Why does ArcMap round the z-values?
Regards,
Pieter
...
3
votes
1answer
51 views
Sensitivity analysis for coarse scale GIS epidemiological model?
I am working on an epidemiological model with disease incidence rate as dependent variable and environmental factors as independent variable. Disease data is available at county scale whereas ...
0
votes
1answer
48 views
Spatial query without spatial database module
I have the following scenario:
Oracle database without the space module.
Application in JEE2 with the following architecture:
-- Entity
-- Persistence (DAO / JPA + JDBC)
-- Business (BC)
-- Vision ...
1
vote
1answer
59 views
Right raster zonal statistics for NDVI at county scale?
I am currently doing a modeling project at county scale in which I have disease rate as dependent variable and environment variables (such as temperature, NDVI and evapo-transpiration) as the ...
0
votes
0answers
43 views
Filtering features in Bounding Box made from lat long?
I have a feature data which is based on lat/long.
To show on the map, I convert them to east/nort.
When dealing with Bounding box, I am getting co-ords is east/north, so I am converting from ...
0
votes
2answers
61 views
oracle search against intersect of a region that covers the whole world doesnt find any records
I am new to Oracle Spatial, I am trying to implement a service that will take coordinates from a map, and search our database to find any geometries that intersect with that map view. I works fine for ...
1
vote
2answers
150 views
Why do I get wrong length using STLength on MultiLineString?
I have 2 MultiLineString representing the a route (first is driving there and the second is the return way) .
MULTILINESTRING ((34.787315938035292 31.318235314177119, 34.788431415005249 ...
