Spatial

问题 I've got a system which basically has to do a query like this: SELECT * FROM MyTable WHERE @parameter.STIntersects(MyGeometryColumn) This is quite simple to do when using vanilla SQL parameters, you just have to create your parameter in a non-typical way (where the builder variable is a SqlGeometryBuilder which I use to create a rectangle): command.Parameters.Add(new SqlParameter { UdtTypeName = "geometry", Value = builder.ConstructedGeometry, ParameterName = "@paremeter" }); Now, When I try

问题 currently I'm using the build in function dist to calculate my distance matrix in R. dist(featureVector,method="manhattan") This is currently the bottlneck of the application and therefore the idea was to parallize this task(conceptually this should be possible) Searching google and this forum did not succeed. Does anybody has an idea? 回答1: Here's the structure for one route you could go. It is not faster than just using the dist() function, instead taking many times longer. It does process

问题 I would like simply delete some polygons from a SpatialPolygonsDataFrame object based on corresponding attribute values in the @data data frame so that I can plot a simplified/subsetted shapefile. So far I haven't found a way to do this. For example, let's say I want to delete all polygons from this world shapefile that have an area of less than 30000. How would I go about doing this? Or, similarly, how can I delete Antartica? require(maptools) getinfo.shape("TM_WORLD_BORDERS_SIMPL-0.3.shp")

问题 I want to store latitude and longitude values of places in a mysql database table. With the future in mind I will want to be able to find these places within a certain radius of a specific location. Having said that, what datatypes should I store the latitude and longitude values in? Please could you provide me with a create table script for columns like so: place_id | lat | long Is there perhaps a column I am missing in the above table that will provide me with additional information that I

问题 I want to store latitude and longitude values of places in a mysql database table. With the future in mind I will want to be able to find these places within a certain radius of a specific location. Having said that, what datatypes should I store the latitude and longitude values in? Please could you provide me with a create table script for columns like so: place_id | lat | long Is there perhaps a column I am missing in the above table that will provide me with additional information that I

问题 I am trying to take create a set of polygons from vertex locations, saved in X,Y format. Here is an example of my data - each row represents the vertices for one polygon. the polygons are squares square <- rbind(c(255842.4, 4111578, 255862.4, 4111578, 255862.4, 4111558, 255842.4, 4111558, 255842.4, 4111578, 255842.4, 4111578), c(257397.0, 4111309, 257417.0, 4111309, 257417.0, 4111289, 257397.0, 4111289, 257397.0, 4111309, 257397.0, 4111309)) ID <- c("SJER1", "SJER2")' I am using

问题 I have what appears to be a correctly configured spatial layer and index and can successfully query a node using findGeometriesWithinDistance REST API call. POST /db/data/ext/SpatialPlugin/graphdb/findGeometriesWithinDistance {"layer":"geom","pointX":15.0,"pointY":60.0,"distanceInKm":100.0} However, when querying using cypher, I get no results (I have tried reversing the order of 60.0 and 15.0 without luck): START n=node:geom('withinDistance:[60.0, 15.0, 500.0]') return n; Cyper returns: ==>

问题 The Question: What is the best way to calculate inverse distance weighted (IDW) interpolation in Python, for point locations? Some Background: Currently I'm using RPy2 to interface with R and its gstat module. Unfortunately, the gstat module conflicts with arcgisscripting which I got around by running RPy2 based analysis in a separate process. Even if this issue is resolved in a recent/future release, and efficiency can be improved, I'd still like to remove my dependency on installing R. The

问题 I'm evaluating Magento for a travel company who will need to do product searches and recommendations based on geographical distance. The company is creating custom holiday packages based on various components (eg: accommodation, tours, restaurant vouchers, etc). These components potentially have overlapping locations (ie: a particular tour might be close enough to several hotels to be considered related to each of them). As a user builds up their custom package by adding stays at various

问题 I am trying to run a query (which I gleened from here) against GeoJson multipolygon data. It processes many of the spatial records but is stopping on a some. I get the following error in the query messages: Msg 6522, Level 16, State 1, Line 10 A .NET Framework error occurred during execution of user-defined routine or aggregate "geography": System.FormatException: 24142: Expected "(" at position 15. The input has ",". System.FormatException: at Microsoft.SqlServer.Types.WellKnownTextReader