A command used to retrieve information from a database

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6
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148 views

Postgis database query optimisation

I have a set of rasters in DTED format which I load into postgis database using raster2pgsql command line tool. Each of rasters is simply stored in a row and described by rid and a value of raster ...
3
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570 views

Select features within a country or bounding box effectively using PostGIS

I imported the planet OSM file into a PostgreSQL 9.2/PostGIS 1.5 server using osm2pgsql. I now want to select certain map features which lie within the bounding box formed by a countries borders, e.g. ...
3
votes
0answers
585 views

How do I determine appropriate Date query syntax for a layer?

I'm writing a web mapping query tool to query Esri mapservice layers by date using the REST API. It has been said that the syntax depends on what kind of database is behind the mapservice layer, as ...
3
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0answers
326 views

How to get distinct values from multiple columns in GeoTools?

Is there a way to get distinct values from multiple columns in geotools? I know I can get unique values from a column like this: SimpleFeatureSource featureSource = ...
2
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0answers
289 views

ArcGIS API for Silverlight : query that displays layer attributes in a dataGrid

I'm working with ArcGIS API for Silverlight to build a webmapping application and I'm trying to display my attributes in a datagrid. I made a try by using this code : void ...
2
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0answers
33 views

Querying a shapefile and returning values?

I have a lot of experience making maps in ArcMap. I don't have much experience programming or working with APIs. Here's the (simple) problem: I create a shapefile of a region and then load the ...
2
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0answers
1k views

How to fire a query from OpenLayers to GeoServer to fetch 'the_geom' column in PostGIS table?

I am coloring the polygon shapes of world_country. I have OpenLayers in my UI, GeoServer as server and PostGIS as db. All I want is fire this query: select the_geom from world_country where ...
2
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0answers
764 views

Proxy trouble with GeoExt Query Panel?

I got the GeoExt QueryPanel working so far, it recognizes the layers available on my Geoserver but it is not able to get the attribute columns for the dataset. I configured an osgeo proxy on my Apache ...
1
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20 views

Testing Oracle query produces valid results in QGIS Python Console

I have a query that searches an Oracle database using a where clause to get the geometry of an object and then zooms to the extent of that object. The value for the where clause is retrieved from a ...
1
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0answers
30 views

Shape comparison language (SCL) - get shapes which intersect extent border

I am trying to write a SCL string for my ArcGIS query, which should return only shapes which are intersected by a border of a rectangular shape (extent). So far the closest I've got is the following: ...
1
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0answers
35 views

Find points within X distance with a specific variable

I am trying to use QGIS to find points within 5 meters of each other that all have a value of <50% for a given parameter that has been loaded through a CSV file. I looked in to doing it with a ...
1
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0answers
35 views

Overpass output city name instead of coordinates?

I did a query to look for certain things. However it only outputs the lat and long coordinates, there is no city data available. I'd like to have the city it belongs to / closest city though. I know ...
1
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0answers
23 views

How to show neighboring polygons and polygon in which point exists

We have a table which has polygon related data stored. For finding if a point (long,lat) is within that polygon I am using following query in mysql SET @vasantKunjSectorC = 'polygon((77.161266 ...
1
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0answers
36 views

Partial extents for ArcGIS android geodatabase creation

I know how to create and download a geodatabase copy of a FeatureServer from arcgis rest services. I also know how to pass LayerQuery to the geodatabase task to filter layer objects and features. ...
1
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0answers
17 views

postgres 9.2 update query on a subset

I wish to make an update using CASE, on a subset of a table. This subset is based on a spatial query. It looks like : update t1 set f1 = CASE WHEN... WHEN... END FROM (select * from ...
1
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82 views

Query to merge simplified polygons according to the map scale-factor

I'm trying to construct a view in PostgreSQL that simplify polygons according to the map scale-factor. Basically I was reading this thread ...
1
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0answers
271 views

ESRI JavaScript API Web Application and SQL Queries in ASP.NET?

My workflow (and security restrictions) for a new html/javascript based web application is making me think that I could program an ASP.NET application, inside which I load the 'map' and the 'legends' ...
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0answers
276 views

ArcGIS Android syncing geodatabase does not work after downloading it with LayerQueries

I need to download a geodatabase from ArcGIS server using layer IDs and LayerQueries in database parameter class and then be able to sync both ways. The ArcGIS Android API examples are only based on ...
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0answers
90 views

How to query a bunch of tables/feature classes which linked together by relationships

I have one feature class and 3 tables which linked together by relationship classes. The feature class, called "buildings", has the fellowing feilds: (1) FID: Feature ID and (2) ID: My own ID This ...
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0answers
61 views

Using statisticdefintion in a querytask

I have a question about using QueryTask to accomplish to jobs: Identify unique value for a county in a graphics layer via mouseover. This unique county value (from a specified field) is used to ...
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0answers
48 views

Geoexplorer - How to open query panel in a bigger window?

The query panel in Geoexplorer (displayed in lower left corner) is so narrow, that entering data in it may be cumbersome. How can i configure Geoexplorer to open this panel in a bigger window and ...
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0answers
124 views

How to count the number of coordinates within x meters grouping by distinct ids?

I have a table "items" of about 1 million rows and 40.000 distinct ids like the following: idx | id | point | lat | lon | the_geom 1 | 1 | 76 | 51.463388 | -0.16869856 | 0101000020E... 2 | 1 | 53 | ...
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130 views

How to Build Query Table from two OLE DB tables using ArcPy?

When I run the following code to create a subset of a table, the error says "An invalid SQL statement was used" [Query]. The error shows in line 39. Is there any idea you can figure this out? import ...
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0answers
135 views

Automatically update the result of a QueryTask

I have developed a application using the ESRI JS API to allow users to create and edit features in a web map. I have used the QueryTask to create summary statistics to report back to the user on ...
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0answers
80 views

Forcing Hash Join Query Plans using PostGIS

I'm currently testing PostGIS 2.0 in a Greenplum Appliance (Postgres 8.2 based) and have hit an incompatibility between PostGIS and the MPP Greenplum environment. The basic query below can't be ...
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236 views

Invalid spatial reference Error

I am getting the error: Invalid spatial reference. Spatial reference must match map's spatial reference. Clear the map layers collection prior to changing the spatial reference when I try to ...
1
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0answers
263 views

Find area with highest relative density of one type of object

I'm using PostgreSQL/PostGIS and I have an advanced type of query. My database contains two types of object - let's say pubs and churches :) Is there a way that I can find the area with the densest ...
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205 views

Querying and summarizing/reporting a multiple tables database

I have to create a database with information on Scottish buildings from 17 and 18 centuries. In order for my data to be searchable I need to have a series of tables connected with 1 to many ...
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224 views

PostGis search query on hstore tags

I am writing a search client, to query postgis db. The search query will be, SELECT tags->'name' AS name,ST_Transform(way,4326) AS pt_lonlattext FROM planet_osm_point WHERE lower(tags->'name') ...
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300 views

ArcObjects: How to Speedup Spatial Query to Feature Layer?

I have ROAD (POLYLINE) Shape File with more than 400,000 Records. I am working on a code which goes like this: Loop through all Feature of the Shape File Take First Feature Find the LAST VERTEX of ...
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0answers
203 views

Query to find lat/lon of a house by street.name & house.number

How can I get house coordinates (latitude, longitude) by street.name and house.number? If it is possible, how I can get it? Many thanks!
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492 views

Cannot join feature layer with SQL Server table with query built in it in ArcMap

I need to join a feature layer with a SQL Server View with a common field in ArcMap. The View was successfully added to ArcMap as data table with some query built on it from Query Builder. When I ...
0
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0answers
23 views

How can I determine an appropriate query based on a join?

I am having trouble coming up with a query that will show the 12 states total population percentage in ArcMap 10.4. I created the spreadsheet below and I have already joined my excel to the states ...
0
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0answers
10 views

How can I create a definition query to show the next 5 years of data, based on a text field with the year on a joined table in SDE?

I need to show the next 5 years of construction data, but I want it to automatically update what is shown based on a text field called ConYearStartNbr that shows when the construction is set to start ...
0
votes
0answers
27 views

Accessing array of x,y coordinates stored as MDSYS.SDO_GEOMETRY / PUBLIC.SDO_GEOMETRY attribute in Oracle 11g?

I am totally new to GIS. I am working with a table in an Oracle 11g database. In each row of this table there are two attributes of interest: one is of type MDSYS.SDO_GEOMETRY and the other ...
0
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0answers
50 views

Publish postgis raster based on column value in geoserver

I have a postgis raster table with the following columns: rid, rast, year, plant I created a wms layer in geoserver pointing to the table and successfully serve out the raster when the table only has ...
0
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0answers
60 views

Overpass-API Ability to download the nodes and ways that intersect the ways of one relation

i am trying to do a query that will detect if a node or way that is included in a relation is also referenced by other ways,nodes or relations. Not sure if this is possbile, i had tried to do this ...
0
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0answers
76 views

GeoExplorer Querying Tool

Are there any ways to add more query options in GeoExplorer? The query options available are limited to: "=", "<>", "<", ">", "<=", ">=", "like" and "between".
0
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0answers
26 views

Geoext - Load Attribute table automatically

May be it is a basic question. I am new to Geoext programming. I have developed a web application using Geoext with East - Table of content, Center- Map display and South - Grid panel I am able to ...
0
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0answers
63 views

Insensitive case query in Geotools to WFS

I'm trying to make an insensitive case query from Geotools to WFS (Web feature service) datasource,I used FilterFactory2 with the method like(Expression expr, String pattern, String wildcard, String ...
0
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0answers
312 views

Multi-level filtering with Web app builder query widget

I have options to use web app builder and web app builder developers edition to design a query task to find a street number. For example, I have got 4 villages and each villages have 10 streets. In ...
0
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0answers
24 views

How to remove lines made with a PostGIS query automatically if origin is not in the map window?

I have a PostGIS point layer with labels. I moved these points because they were too close. To connect label and point, I created a line vector layer which was made with a query in the DB-Manager ...
0
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0answers
24 views

Assign a dummy value for removed features in a Polygon-Grid

I want to calculate the entropy index for landuses classes for an area based on a 100m Polygon Grid. I did find an existing toolbox that does all the required calculation. Input features are the 100m ...
0
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0answers
97 views

Qgis-Web-Client Query: Search Panel

I open the sample project helloworld with QGIS I go in the file site / js / GlobalOptions.js and start very simply change the language or the layer order. I do tests to see how the various commands I ...
0
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0answers
277 views

Multiple LEFT JOIN in PostgreSQL

I got a "nice" problem with a query in PostgreSQL with a multiple join SELECT DISTINCT "Monitoraggio_L001_L008_2015_aprile"."ID", "Monitoraggio_L001_L008_2015_aprile"."Ordine", ...
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0answers
7 views

Not able to use Find by Layer feature in ArcGIS Online, when data is url .csv?

In AGOL, when using Layers linked with a url to a .csv, the 'Find' by layer feature in the Details/Edits section is not active. Meaning that layers cannot be searched using the 'Find' feature. Is it ...
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0answers
53 views

Getting connected points in intersection from OpenStreetMap using PostGIS?

I'm trying to get the points that connected with the intersections. suppose that I know the point of the intersection (if we see in the pictures, I represent the intersections as black node). Now ...
0
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0answers
70 views

A New Query Option In GeoExplorer To Calculate All Of Features In A Layer

Is there a tool to do this? A query option to calculate the number of exist features in a layer! For example on this picture I have 220 point in my layer, but is there a query option to do this that ...
0
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0answers
190 views

ArcMap ObjectID seems to be getting changed, any ideas what might be doing it?

I am working with ArcMap10.0 and MDB's, often creating Definition Queries based off my ObjectID with the understanding that this unique identifier should not change over time. ie. if I create ...
0
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0answers
20 views

How to reset query format in QGIS?

I have a raster layer (wms) that I can query for some info (1). The query window offers different formats for this (2). However when I select "Object", the query result vanishes (3). I looked ...