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

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83 views

How to cut/split multipolygon with blade (linestring) into two pieces using PostGIS? [closed]

I struggle to do split operation in postgis I tried to build a query but Im always fail. Id like to cut a multipoligon with a blade (a linestring) into two pieces. These two objects have specific ...
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1answer
48 views

Rewrite query to match two points with a linestring in a different database table

OK, not sure if I've worded the title brilliantly, but here goes: Suppose I have: a table "gps_nodes" containing columns: "EASTING" (containing longitude data) "NORTHING" (containing latitude ...
3
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1answer
364 views

PostGIS intersection function

I have a problem with intersection function. I built my query following http://manual.linfiniti.com/en/postgis/geometry.html, 5.7 section. I made my clip object, a red linestring frame: But after ...
3
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3answers
389 views

Sqlite, Python 2.7 and Spatialite

I am trying to spatially enable my sqlite database: import sqlite3 db = r'c:\temp\mydata.sqlite' conn = sqlite3.connect(db) conn.enable_load_extension(True) cur = conn.cursor() cur.execute(r"SELECT ...
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2answers
98 views

How to form SQL Expressions with mix of integer/numeric and text/string fields/values in ArcPy?

I am trying to create a query for the select by attribute function within a Python script.This is my current code. lot = '96' dp = 756421 lotFile = ...
5
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1answer
156 views

Is it possible that a good spatial index just cannot be made?

I have about 6 million rows with geography spatial features - they are all 1000 meter radius hexagons all over the US. There are a couple hundred thousand that would have been NULL, which I updated ...
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1answer
110 views

Calculating difference between bearing values in degrees

Suppose I have 3 geographic points, A, B and C. I can calculate the bearing of B from A (in degrees) using this SQL snippet: degrees(ST_Azimuth(geogA,geogB)) as brg_a_b ...and the same of C from ...
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2answers
476 views

SQL Syntax to extract (convert) Strings with Degrees Minutes to Decimal Degrees

I have a PostgreSQL/PostGIS database with a two string fields containing Lat and Long coordinates in degrees and decimal minutes, like this 45° 24.5' N 3° 43.01' E. How can I convert them into ...
3
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1answer
60 views

Use selected value in postgis function

How can I use the selected value from a SELECT statement in a PostGIS function. e.g. using the geom_way from SELECT geom_way FROM osm_2po_4pgr ORDER BY ST_Distance(ST_GeomFromText('POINT(21.323329 ...
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1answer
35 views

How to do “random” distribution of certain classes to certain amount of polygons with respect to spatial constraints

I have a polygon layer. Now, I would like to assign/allocate/classify these Polygon into 13 different classes respecting spatial constraint, in my case: neighboring polygons (sharing line or nodes) ...
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55 views

Multiple geometry in a cursor SQL

I have a cursor which I create from a table which has one geometry field only. But in my cursor I would be using two geometry fields as I need to calculate two different areas.Below is the sql ...
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1answer
267 views

How do I insert a geometry as WKT to SQL Server Spatial with PHP?

I have a web mapping application built on Bootleaf (Leaflet + Bootstrap). Using the leaflet Draw plugin the user can create a polygon on the map. I'd like to insert that polygon into a geometry ...
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2answers
121 views

Can I use the LEFT (string) operator in ExecuteSQL()?

In QGIS I can use the LEFT operator on a dataset like this: LEFT( "Name2",3) ='031' What is the syntax for using this expression with ogr in python? Isn't this the right syntax? ...
0
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1answer
119 views

How do you create a CartoDB viz with a dynamic SQL statement?

I want to create a CartoDB viz where the where parameter in my SQL statement changes dynamically at runtime. When I share my CartoDB viz from the dashboard, I can't help but notice the the SQL ...
2
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0answers
33 views

Multiple Cursors

Below is the sql statement which I have explained below. Declare Cursor c1 is select store_number ,0 as total_area,0 as BG_ID ,0 as store_geom from table1 where CLIENT_ID= 1 and ORG_ID ...
4
votes
2answers
759 views

Import large CSV file into PostGIS

I am trying to import CSV files into PostGIS. Following this post, I have created tables before. I found other suggestions saying that I can run the copy command. If I run this command: COPY table ...
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0answers
30 views

SQL cursor issue

I am trying to create a new table using a cursor and a select statements. Declare Cursor c1 is select store_number from table1 where CLIENT_ID= 1 and ORG_ID = 1 ; Type C1_TAB_TYPE ...
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1answer
269 views

Trouble with INSERT in PostgreSQL 9.1

I am trying to execute the following: INSERT INTO lithic (cp_east, cp_north, type, material, art_count, comment, field_no, gps_unit, initials, rec_date, cortex, geom) SELECT (cp_east, cp_north, ...
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2answers
87 views

shp2pgsql mangles date field — quotes data as if it were char or varchar

I'm attempting to import a shapefile into postgis via shp2pgsql. Among the fields in the shapefile's .dbf file is a date field with format yyyymmdd, which is a valid date format for postgresql. ...
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0answers
61 views

Is there a limitation in quantity of joined tables using spatialite views?

I've one point layer in qgis and several non spatial tables in a spatialite database. Now I want to create a view as you can see in the following: CREATE VIEW testansicht10 AS SELECT ...
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1answer
49 views

Issues with pgrouting workshop code in postgis 2.11/pgrouting 2.0

I'm having issues getting the pgrouting workshop to work on Postgresql 9.2/PostGIS 2.11 and pgrouting 2.0 on windows. How can I rewrite the following php/sql code and make it compatible with my ...
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1answer
64 views

Create Area or Polygon based upon a Series of points

i have a large list of points that i would like to merge to create an Polygon based upon an attribute. Essentially an area that encompasses all points. x | y | attr ____________________ 1 | ...
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1answer
166 views

ArcMAP SQL Statement Iterate Feature Selection 'IN' 'BY' 'IS' - escape character

We have a problem when selecting Features from a Feature Class in ArcMAP 10.2 using the Iterate Feature Selection tool in Model builder Our dataset has a Attribute Field with two character codes like ...
3
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1answer
285 views

Edit SQL Server table (not registered with geodatabase) with arcpy

I am trying to update some rows in a SQL Server database table (not registered with geodatabase) with arcpy.da.UpdateCursor. However, when running the deleteRow(), I get the error return without ...
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1answer
49 views

Using Like on Join Field

Ok, so this has probably been asked by someone else out there somewhere but I can't find it via google or this stack, so... I've got two tables from an SDE database (SQLServer Express 2008 r2) that ...
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21 views

Multiple cursors in sql for SDO_DIFFERNCE

This is a follow up to a previous question I had regarding sdo_difference. Now in this case I am trying to use cursors so that I can do it for all records at once.In the below code I select a list ...
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2answers
121 views

sqlite version error with ogr2ogr

I am trying to randomly select some points from a shape file using ogr2ogr and an SQL query via sqlite but it seems to baulk at the sqlite version: ogr2ogr -sql "SELECT * FROM probe_2004to2012 WHERE ...
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1answer
44 views

Wrong output wth group by and aggregate function in spatialite

I have a grid and for every cell I want to set the column "landuse" according to the largest intersecting polygon. SELECT grid.PKUID, landuse.landuse, ...
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132 views

Date Parameter in model builder - ArcMap

Basically I'm building a model where the user has to select the data from a drop down list and the result is executed. I have a problem when trying to pass a date as a parameter. Below you can find ...
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0answers
81 views

Trying to load ThinkGeo shapefiles into SQL

I am new to GIS, but have a work project that I need to integrate CoastLine geometry data in to a report. I downloaded some of ThinkGeo's OpenStreetMap shapefiles and have tried to load them using ...
2
votes
2answers
345 views

CartoDB- Passing selected features bounds to map center parameter (Zoom to selected features)

Looking to build a light-weight viewer for some data we have hosted on CartoDB. I'm looking to have a user input their address into an input, pass a query to CartoDB and have the map zoom/pan to the ...
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1answer
638 views

Postgresql Trigger to insert records in my table from another one

I spent few days trying to resolve this question but it was impossible. I have two tables: Table1. CREATE TABLE point ( id_point integer NOT NULL DEFAULT, layer text, elevation numeric, ...
0
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1answer
46 views

Could SQL performance be increased by storing rotations of the data?

I'm working on a project where this kind of SQL Psuedocode would apply: SELECT * FROM objects WHERE (distance My inputs are latitude and longitude, and my database holds latitude and longitude. ...
3
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1answer
71 views

New attribute creation using ogr and regex

I've got a folder full of dxf files with elevation values included as part of a long text attribute. I've written a regex expression to extract the elevation value, and would like to add it as a new ...
0
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1answer
321 views

Postgis: find geometry within multiple polygons

I've got two tables with geometry in it. Table 1:items holds items with a point geometry; while the second table property_zones holds polygons. The Items: CREATE TABLE public.items ( id integer ...
4
votes
1answer
148 views

How to query nearest date in ArcGIS Server REST?

How to query nearest date (today) in ArcGIS Server REST? Table: ID NAME DATA 1 test 2013-06-01 13:00:00 2 test1 2013-06-01 16:00:00 3 test2 ...
5
votes
1answer
194 views

ogr2ogr selecting features by attributes

I am writing a shapefile after some processing; however, in the final step I need to do some selection by attributes from the the shapefile. I am using the command in a shell with the aim of using it ...
4
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2answers
165 views

Maximum length of WHERE clause with IN statement

I need to get all features from feature class where their field value matches to input array. To achive this one may set IQueryFilter.WhereClause property similar to 'FIELD_NAME IN (array[0], ...
2
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1answer
185 views

How to Buffer based on SQL expression?

Is there any way to optimize this code? It creates two buffer feature classes based on two different fields in the shapefile attribute table import arcpy from arcpy import env ## Set Workspace ...
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0answers
41 views

Selecting a bounded area within a raster

I am new to postgresql. I have imported a 256kb sample raster (.tiff) into postgres with tilesize 100x100. Now I need to select the area (rectangle) from the center of the image using sql query. Then ...
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0answers
108 views

How can I retrieve/query data from shape file for forms/grid in website?

I've made a site using openlayers and geoserver. currently im serving WMS layers from geoserver (shape files). I want to add in my site a search form that the user can search for data (which I have in ...
3
votes
1answer
1k views

What expressions for QGIS field-calculator?

I do not understand what language I have to use in field-calculator and labels on QGIS: SQL or Python? And where I can find the possible script/expressions to use? in the image you can see the ...
2
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2answers
306 views

What is faster for geoprocessing (intersect) big shapefiles?

I have 200 Mb shapefiles of polylines downloaded from OSM. I've been working with QGIS 2.0 in Ubuntu 64 Bit 8 Gb RAM to make some geoprocessing tasks and it's taking 2 days for processing. Once I've ...
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3answers
237 views

Differences between SQL dialects in QGIS vs ArcView vs Oracle

I'm kinda new with SQL queries and there is something I don't get: A SQL query in QGIS is written differently than the same query in ArcView and will probably also be written differently if I want to ...
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127 views

Geoservices REST JSON to SQL Server Geometry using Python

I'd like to hit a Geoservices REST endpoint (below) to return json and push this into a SQL Server Geometry table using Python. Ok so I can achieve this via ogr using below via command line: ...
2
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1answer
478 views

How to use GROUP BY with arcpy.da.SearchCursor in file geodatabase?

fc = "C:\Users\AuxS3-4\Documents\ArcGIS/Default.gdb\Malla" fields = ('OBJECTID','Sentido','Carriles','idMalla') sqlclause=(None, "GROUP BY Sentido") cursor = arcpy.da.SearchCursor(fc, ...
2
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1answer
90 views

How to split polygons with another polygon and inheritage data?

Let's say that we have two tables with polygons representing areas. Table A and Table B. Geometries from table A represents both the valid and invalid areas. And the geometries in table B represents ...
0
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1answer
643 views

SQL to get points within a certain distance

I am new to using spatial data types in sql server. I have managed to create a column of Approx 50,0000 geometry points (from x,y data) and would like to find out which (count number of) points are ...
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1answer
191 views

Multiple input shapefiles for ogr2ogr sqlite spatial operations

I'm running up against an issue doing a spatial operation requiring multiple input shapefiles using ogr2ogr and sqlite. I have: ogr2ogr -f "ESRI Shapefile" output.shp input.shp -dialect sqlite -sql ...
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40 views

Can I create a table showing all the Srid values for all the tables in my DB?

Hi I can identify the current SRID of one table (at a time) in my database, but I was wondering if there was a way to bring back a single table that would tell me all the datasets that do not ...