Tagged Questions

Acronym for Structured Query Language. A syntax for retrieving and manipulating data from a relational database.

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11
votes
1answer
410 views

Nearest Neighbor Grouped Selection in QGIS

OK - so I have an interesting problem I am trying to solve. I have a list containing over 100,000 points in lat/long format which I have imported into qgis. Now, what I am trying to do here is group ...
0
votes
2answers
575 views

Correct SQL statement in FME?

I am trying to write SQL statement in WHERE Clause FME in Navigator but it does not work. WHERE Clause: NAME IN SELECT CONCAT(''$(',SELECT REPLACE ('Roman Ann Jack',' ',','),')'') This sql code ...
5
votes
1answer
1k views

How to find nearest neighbors between two tables with point locations in SpatiaLite?

I have started playing with SpatiaLite today and already stumbled upon a problem. For each point location stored in tableOne I would like to select one, nearest (linear distance) point from tableTwo. ...
3
votes
1answer
640 views

Adding rows of data to a non-spatial table in ArcMap with a SDE SQL Server for Metadata purposes

I'm attempting to use several non-spatial tables to better organize the large set of feature classes I continually add to a SDE Geodatabase (SQL Server Express). So I have several tables setup and ...
6
votes
1answer
672 views

PostGIS and invalid SRIDs

I'm having difficulty with a PostGIS query. I am trying to query my database (world_countries) using a bounding box drawn on a google web map. The objective of this query is to find any countries that ...
3
votes
1answer
394 views

Check if an object is empty in mapbasic

I have mapbasic code that manipulates the obj-column in a point-table. Some rows doesn't have any geometry so the obj-column is empty. My question is how to check if there is no object? All the ...
7
votes
1answer
93 views

How to rectify the walls of buildings in PostGIS?

I need an operations in PostGIS to eliminate intermediate vertexes in a polygon to rectify the walls of a building. I was revising http://trac.osgeo.org/postgis/wiki/UsersWikiExamplesSpikeRemover but ...
7
votes
1answer
576 views

PostGIS Intersection and Summarise Attributes

I am usually an ArcGIS desktop user, but keen to start using PostGIS more and I have a really big bit of processing to do. Not sure what functions to use, hopefully someone can help. I have a polygon ...
4
votes
2answers
261 views

Merge reversed linestring in correct order in postGIS

I want to merge linestring in the correct order in postGIS, but sometime they are reversed so something like this : select astext(linemerge(ST_union( ST_GeomFromText('LINESTRING(3 3, 2 2)'), ...
2
votes
3answers
676 views

Inserting polygon centroids into an additional column in PostGIS

I'm trying to calculate the x and y centroids for a table using ST_Centroid. The documentation says that it returns the geometric center of a geometry. I first made a column X: ALTER TABLE ...
5
votes
1answer
500 views

How to export a PostGIS raster to PNG?

I have a raster which is split into 30 tiles and I want to dump them all into PNGs. I've read the documentation http://postgis.refractions.net/documentation/manual-svn/RT_ST_AsPNG.html but still ...
2
votes
1answer
414 views

How to delete records from multiple, similar feature classes by attribute values using an SQL statement?

I have several hundred geodatabase feature classes which all have the exact same fields. I need to go through each of those feature classes and delete any records which match an SQL query (the same ...
3
votes
2answers
1k views

Bounding box for PostGIS table

Is there an easy way to get the bounding box for an entire table in PostGIS? Thanks
13
votes
1answer
579 views

Identifying topological relationships using PostGIS

I'm trying to perform a basic typology analysis using PostGIS. My objective is to find any polygons that touch other polygons. To do this, I thought the ST_GetFaceEdges would work (reference). I want ...
12
votes
5answers
3k views

Use arcgis with SQL Server 2008 as a backend

I'm wondering how best to use arcgis] and sql 2008 together. At the moment we run manual imports and exports between sql 2008 and arcgis 10 shape files. With sql 2008 having a geography data type I ...
0
votes
2answers
497 views

Mysterious MapInfo query syntax errors

I'm struggling to get what seems like a perfectly normal query to execute in MapInfo v10. In SQLite Manager (an excellent firefox plugin), this works as expected: SELECT area_name, street_name, ...
2
votes
2answers
1k views

Trigger on SQL Server 2008 ArcSDE 10 and ArcGIS Server 10

I need to build a sql server db trigger to update a date field with the current date when a record is inserted or updated, I think. I will be using the date field as a way to recognize ...
2
votes
2answers
358 views

Parameterized insert query to PostGIS fails

I have a PostGIS database table that I need to insert data into. I'm using Python 3 and the pg8000 interface to Postgres. Somehow, parameterized inserts do not work. If I do iq="INSERT INTO ...
5
votes
1answer
272 views

How to filter points based on proximity while inserting into PostGIS?

I have a large amount of locations that need to be inserted to a PostGIS database. However, I'd like to aggregate these points so that if there's already a location, say nearer than a kilometer, then ...
1
vote
0answers
226 views

T-SQL with SDE and Web Map ArcGIS Server 10 MSSQL 2008

I need to build a system whereby the user of a web map (the standard web map that ArcGIS Server Manager builds) can edit a feature class's attributes. The attribute will be a 'Comments' field. The ...
2
votes
2answers
209 views

Is there a way to save manual QGIS changes to Postgis to SQL script?

I am manually editing a Postgis layar with QGIS and would like to export these manual changes in the form of an SQL script. This way: I can do it automatically next time i need to it is easier to ...
3
votes
2answers
829 views

How to write a SQL WHERE Clause using Multiple Choice values in FME?

I published a parameter which is of Choice Multiple type. I wish to use values from this parameter for WHERE Clause when Reading Inputed Data in the begin of Workbench. So there is no problem if I ...
6
votes
4answers
583 views

SQL expression for finding strings including letters in ArcGIS 9.3.1

I'm working on ArcGIS 9.3.1. I have a shapefile with a string field containing point names like these: 10 12 12/13 t/9 6577y 1234 12t9 124y67 u9 and so on (and yes, I know it looks like a colossal ...
5
votes
5answers
2k views

How can one execute an SQL script in field calculator in ArcGIS 10?

I am trying to transfer over row data from a table to columns in a shapefile table. There is a common "SA" variable between the two (i.e. the study area number) but there is more than one land use ...
7
votes
1answer
277 views

Get all Nodes from a List of adjacent LineStrings in PostGIS

I use PostGis and pgRouting. I have a table with geometries of the adjacent edges returned by a shortest path query. I want to concatenate these edges and retrieve a list of all nodes these edges ...
6
votes
1answer
743 views

Performance Gain Through GIST Index for Point in Polygon Query

I have two tables: locations(id,region_id,the_geom) and regions(id,the_geom). For each location point I want to determine the region it is located in: UPDATE locations SET region_id = (SELECT id ...
3
votes
1answer
363 views

Shorter Version of this SpatiaLite Query

I've been doing some spatial queries using spatialite, and they're large enough that a spatial index becomes a must. An example of using an index is given in the tutorial spatialite> SELECT ...
4
votes
1answer
189 views

PostGIS Query: All rows within 1 hour of each other which intersect

I'm using postgres (postgis) and i want to perform a query that returns all rows which geometries intersect and have a timestamp within 1 hour from each other. What would the SQL statement look like? ...
6
votes
2answers
2k views

PostGIS: Find points that lie within a set of coordinates

I have a PostGIS db, and I want to find the points that lie within some region (a bounding box). I have two sets of coordinates, from which I can get all four rectangle points that form the box (if ...
0
votes
1answer
534 views

MapInfo equivalent of SQL 'AS' statement

I'm trying to execute a SQL query in MapInfo, and want to change some of the column names to something more readable. The SQL command 'AS' doesn't seem to work - is there a MapInfo equivalent?
1
vote
1answer
415 views

How to extract data from a POINT column in PostGIS using JAVA (jdbc)

How do you get a value from a column which has a point data type. I've just switched over from MySQL to PostGIS. I have a column which is called point and is of type Point. I want to get that value ...
3
votes
2answers
1k views

Reading Coded Domains from ArcSDE 10 RDBMS using SQL/ADO.net

I need to read ArcGIS Domain Coded Value pairs (value/description) from SQL Server / Oracle in SQL (i.e. not using ArcObjects). This is an XML field. I can get the domain definition thus select ...
6
votes
1answer
416 views

Editing tables using SQL in ArcMap

We've recently started working with ArcMap, having used MapInfo previously. I've created a shapefile in ArcCatalog and want to update some columns using SQL. In MapInfo I'd write the following command ...
2
votes
2answers
458 views

ArcObjects: Alternative workflow to using a SQL query with over 1000 values in IN statement

I have a ListBox listing the unique values of a column in a feature class; the user can select any number of values and click a button to then zoom to the set of features matching those values. A ...
4
votes
2answers
413 views

Using a bounding polygon, instead of a bounding box

I've got a large set of LAT/LON coordinates. Up until now, when I needed to select out those that fell within a certain region, I'd just create a bounding box using some MINx, MAXx, MINy, MAXy values ...
1
vote
0answers
187 views

Color polygons using SQL Database based Rules in Openlayers

I want the rules to be applied according to values in a database. Is it possible to include external database information that is not in the shapefile? In spoken words the original rule is "Color all ...
2
votes
1answer
437 views

Convert SqlGeometry data from SQL directly to Tiles / PNG file

I would like to know a basic method for 'exporting' SqlGeometry data from SQL Server 2008 to a Tile Server / PNG File generator. I already have a Silverlight Map application which uses a Custom Tile ...
5
votes
2answers
317 views

Selecting POIs around specific buildings using PostGIS

The problem: I need to select, for each residential building in my table that has say at least 2 pharmacies and 2 education centers within a radius of 1km, all POIs (pharmacies, comercial centres, ...
4
votes
1answer
193 views

Sort by geometry using INHERITS?

hope everyone's doing well. I have a statewide point data set (parent table: 600K rows, 500 columns) I need to analyze at multiple scales based on several different spatial divisions. I'll also need ...
0
votes
3answers
2k views

Defining a Query with Multiple Values

I have been trying by best to create a definition query which would select a group of municipalities from among the many in my state. I have tried commands of all sorts of variations from ...
2
votes
3answers
544 views

Definition Query to Python script on Oracle 9i and ArcGIS 9.3.1

SUBTYPECD=1 AND SERIESNAME NOT LIKE '%-%' AND OPERATIONALSTATUS IS NULL OR SUBTYPECD=1 AND SERIESNAME NOT LIKE '%-%' AND OPERATIONALSTATUS = 976 The above is my def query in ArcMap against ArcSDE ...
6
votes
1answer
238 views

Assign Z value to start & end of PostGIS line

I have a line table in my PostGIS database and a table with invert levels for the start and end of each line. My goal is to create create 3D lines in my table, from my invert data. I know I can use ...
6
votes
1answer
522 views

Spatial joins in OGR SQL

I have seen that OGR supports it's own form of SQL, I was wondering if it's possible to do spatial joins. Something like select all objects where one intersects the other. I did have a look around ...
10
votes
3answers
854 views

How to interpolate GPS Positions in PostGIS

I have a PostGIS table of GPS positions for every five seconds: 2011-01-01 00:00:05, POINT(x1,y1) 2011-01-01 00:00:10, POINT(x2,y2) 2011-01-01 00:00:15, POINT(x3,y3) ... I'm looking for a query ...
5
votes
3answers
2k views

Is there a way to label points in a regular interval in ArcGIS 10? [SOLVED]

Estou trabalhando com linhas em estradas representadas por uma grande grande quantidade de pontos em sequencia. Uma vez que colocar o nome de todos os pontos tornaria a identificação impossível, ...
4
votes
1answer
422 views

Error using ST_AddPoint for adding a new point to a polyline in PostGIS

I have two PostGIS tables, one where I store points, named "nodes" and another with where I store multilinestrings, named "lines". I'm trying to append a new vertex to a line using one of the nodes ...
3
votes
2answers
251 views

SQL statements on a Geodatabase

I have converted a shapefile into a geodatabase which I use for geocoding via the ILocator interface. It has the extension (.mdb) and contains address fields with a point which is stored as a long ...
6
votes
2answers
2k views

Creating spatial tables with PostGIS

In the PostGIS documentation it says that there are two steps to creating a spatial table with SQL: Create a normal non-spatial table. Add a spatial column to the table using the OpenGIS ...
5
votes
2answers
231 views

ArcSDE recently modified geometries

ArcSDE 10 with a MS SQL 2005 backend. I am trying to see the most recently modified geometries using SQL so that I can use it to update another GIS database running PostGIS. Has anyone tried this ...
5
votes
3answers
2k views

ST_Intersection slow query

I am trying to perform an intersection between two layers: Polyline layer representing some roads (~5500 rows) Polygon layer representing irregularly shaped buffers around various points of interest ...

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