The process of connecting two or more datasets based on a common attribute or spatial location.

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2
votes
1answer
47 views

How to improve join between shape and view?

I have a problem with a simple join and I don't know what to do: I have a shapefile with 400,000 parcels, in this shape I have only one column with the parcel id with an index. I have a Materialized ...
13
votes
1answer
2k views

Why do simple joins on small datasets slow down ArcMap so badly?

ArcGIS 9.3.1, ArcInfo. I have some small file geodatabase and SDE featureclasses (few thousand records each, 50 columns) that I am doing attribute joins on. After the joins, drawing of the map is ...
1
vote
1answer
328 views

Join and Calculate vb.net

Im trying to join an excel table to a shapefile and then calculating those fields using vb.net. The code I have written has no errors, but won't work when I try it in ArcGIS 10.1 and I'm out of ideas. ...
1
vote
1answer
186 views

Slow performance with Add Join and Calculate Field?

I have a point layer and a table with approximately 100 fields. I need to join the table to the point layer based on a key field and create a new shapefile / feature class. This script has been ...
0
votes
0answers
24 views

QGIS table join with multiple fields

I am trying to join info from a DBF to a shapefile. There isn't a perfectly unique identifer. Is there a way to join the tables with 2 or 3 fields? The simpler the better. I am just getting familiar ...
0
votes
0answers
24 views

Using the QGIS Graphical Modeller how can I choose specific fields to make a join based on?

I wish to join one field from a shapefile to another shapefile within the QGIS graphical modeler. I am aware that there is a 'Join attributes table' algorithm but this joins all of the fields from the ...
2
votes
1answer
120 views

ArcMap many-to-many join

I'm working in ArcMap 10 and can move around in R, though am not an expert. I have a shp file and an xlsx file. The shp file is 20,221 rows and includes a field GID (grid ID) which is not unique ...
1
vote
0answers
22 views

Can I define a style for one layer, taking into account a defined relationship with another? (QGIS 2.8)

I have two sets of data. A large set of lines with a line_ref field, and a small data-only (no geometry) table with a matching line_ref field (let's say for argument's sake that the data-only table ...
0
votes
2answers
33 views

add attribute information from polyline to a point shapefile (QGIS or ArcGIS)

I was wondering if, and how, it is possible to add attribute information from a polyline to a point dataset. I have a network layer with information per street how many scooters went over this street. ...
1
vote
1answer
36 views

QGIS Categorized Symbology based on joined table

I am trying to create categorized symbology for a data layer. The column that I would like to base the categories on is a result of a table join. For some reason it isn't working. All of my polygons ...
0
votes
1answer
17 views

CartoDB table join error: Column reference is ambiguous

I've got a CartoDB question that seems dumb b/c the layer is correctly rendering. Anyway, I have two layers, named sampling_points sample_point I'm trying to inner join the sample_point data to ...
2
votes
1answer
353 views

query / filter on attribute tables with external tables joined

i tried to do some queries on joiend table fields ... i've got/found some answers concerning version 1.8 - which result in "use select + export to create a combined dataset" so i just did some tests ...
2
votes
2answers
76 views

PostgreSQL/PostGIS Geom to JSON with Inner Join to another table

I am currently producing JSON from a database successfully using the following query: SELECT row_to_json(fc) FROM ( SELECT 'FeatureCollection' As type, array_to_json(array_agg(f)) As features FROM ...
0
votes
0answers
39 views

How do I join multiple features with a single geometry-less table entry?

I have three features with the same ID, let's say "5". I also have a corresponding text table containing IDs among other info (for example a "category" value). I want to join the table with the ...
0
votes
1answer
24 views

Update the_geom field with polygons from a different table using one common field

Using CartoDB SQL API I'd like to: Update the_geom field in a table that has no spatial data by selecting the polygons from a table with spatial data and joining based on one common field.. In this ...
0
votes
0answers
32 views

How to find soil names for “mukey” in USDA Soil Data SSURGO

I an trying to join the soil descriptions in the tabular data to the spatial data in ArcGIS. I have both the mukey and musym in the attribute table associated with my soil polygon layer in my map. ...
0
votes
1answer
33 views

Point inside st_dwithin with wrong results

I want to get all points, that are in the same area. Therefore, I have the following query for my table check: SELECT l.location_id, l.location FROM check l INNER JOIN check l2 ON ST_DWithin ...
0
votes
2answers
42 views

Performing batch Join Field in ModelBuilder?

I have a list of 250 feature classes (X1, X2 X3, ...) which all have an individual field that I want to join to another feature class Y. The join can be established through a common field that are ...
14
votes
4answers
5k views

How to join attributes from nearest point in QGIS?

I have two layers with points, call them A and B, each with different attributes. For each point in A I want to join all the attributes from the nearest point in B. Ideally this would also include ...
1
vote
1answer
35 views

Joining Information from Point and Polygon

I tried to find the answer to this question by searching, but I was not too successful. My issue is that I have a point file of around 400 Organizations that do not have a column of county names tied ...
3
votes
3answers
71 views

Field Join by Approximate Data in ArcMap?

I've run into a bit of an issue. I recently pulled data from the CDC website concerning Suicide rates by county. However, the csv file does not have locational data. Luckily, my project is about the ...
0
votes
0answers
21 views

How to show an overview of all Joins and Relations in ArcMap Project?

Is it possible to get an overview of all Joins and Relations between my Tables and Files in ArcMap 10.1? Right now I have to right-click on every file to see how it is connected to another file. It ...
0
votes
2answers
86 views

can't join excel(2013) to ARCGIS 10.2.2

When trying to join Excel datafile to shapefile in ARC GIS 10.2.2 I keep getting the following message: "Failed to connect to database. An underlying database error occurred. Class not registerd." ...
1
vote
2answers
2k views

Join Fields from Multiple Tables to One Table in Modelbuilder

I have 40 tables with about 2000 row with a shared ID that I want to merge into 1 table with 2000 rows. I only want to retain a distance field calculated within each table. The distance field is ...
0
votes
1answer
60 views

Creating many-to-many table from intersection between two polygon layers in QGIS?

I have created a buffer around several points. I want to intersect this layer with a Census Tract layer. My end goal is to create a table that would list all the census tracts that intersect with the ...
3
votes
2answers
687 views

Arcgis not seeing my column header to join tables

I am trying to join a data table to the attribute table of a shapefile. I have done all the necessary steps to makes sure it works: removed spaces, not use numbers in column headers, remove illegal ...
3
votes
1answer
29 views

Joined tables and now field calulator is greyed out

In ArcMap (10.2), I accidentally calculated the wrong field outside of an edit session, so there was no way to reverse my action. I restored a previous version (shadow copy) and joined the tables ...
2
votes
1answer
32 views

Can I join a table with a field with several rows with the same word to a polygon?

I have a table that looks like: Name X X X Y Y Z Z I have a polygon feature class with the attributes: Place X Y Z Essentially, I want to join that table to the polygon, but I want each row in ...
1
vote
0answers
35 views

Joining to data in ArcGIS Online

I'm a GIS professional. One of my clients (an ArcMap user) has asked our firm to teach some of his staff about ArcGIS online. In so doing, we are to provide an overview of GIS-- how to think ...
3
votes
2answers
104 views

Join table field with shapefile programatically (via PyQgis)?

The following is currently unsuccessful at fulfilling a table field join to a point shapefile in Qgis. All instances of the join object will print the proper values, and no error is flagged when ...
6
votes
6answers
1k views

How do I remove a join (between a standalone table and a feature layer) with ArcObjects?

I already know how to do a table join with ArcObjects, via the IDisplayTable, IMemoryRelationshipClassFactory etc. interfaces. Here are some links to resources that have example code for this: ...
0
votes
1answer
21 views

How to join multiple lines (branches of a large stream network)

I've generated a channel/stream network based on a DEM, but each branch of the network is split into very small lines. I'd like to have the network divided into as few separate lines as possible, so ...
6
votes
2answers
3k views

Joining tables without losing original field names in ArcGIS for Desktop?

I'm wondering if there is any method to preserve the original field names in ArcGIS when I join csv. tables to a Shapefile. I ask, because sometimes I join tables with 10, 20 or even more columns ...
1
vote
0answers
25 views

Saving fields after a raster join with python arcgis

I am working on a raster processing script in which i join a categorical raster with a table that includes some extra data on each category. After much hassle, I have the join working, but I can't ...
1
vote
1answer
30 views

Joining dBase (*.dbf) table to Coverage?

I have a dbf table and a polygon coverage. How do I join and save the joined data to the coverage without exporting to feature class and then re-creating a coverage in python? I have been looking at ...
1
vote
1answer
30 views

Returning list of field names in joined table using ArcPy?

I need to look at all the fields in a joined table performed through arcpy. I am instigating for fields in arcpy.Listfields(Feature): print fields but it is returning a large list of: ...
1
vote
2answers
66 views

How can I release the lock file on a DBF after removing its join to a FeatureLayer using ArcObjects?

I found another post with two different answers on how to remove the join between a feature layer and a standalone table, but neither method successfully removes the lock file ...
3
votes
1answer
86 views

Using ArcPy to Remove Join?

I am trying to remove a join in arcpy and have been all over the forums and help topics but cannot get my script to remove the join. I have tried many combinations of inputs to the remove join but to ...
2
votes
1answer
50 views

The best practice to join\relate\connect 4 feature class together

What is the The best practice to join\relate\connect communities\UMP\BuiltUP\Admin boundaries, Could you please consider the following scenario: I have a feature class with a name “community “ ...
1
vote
1answer
44 views

Join traffic data (point) to a road network (line) - Section between two roads - ArcGIS

I am trying to analyze the vehicle traffic in Melbourne's (AUS) road network. I have two files: the traffic data (point data for a given latitude and longitude with the average hourly traffic between ...
3
votes
2answers
868 views

keep the same field headers after joining a table to a shape file in QGIS

I noticed that after joining a table to a shape file the headers of each fields in the table used for the join are changed by QGIS and they are attributed to a different name. For instance, i had a ...
8
votes
1answer
106 views

Can you use wildcards for column headers in Field Calculator?

I know you can use wildcards for fields like so (in the Field Calculator): case when "column" ILIKE '%example%' then 1 else 0 end Can you do something similar for the column headers themselves? I ...
2
votes
1answer
292 views

How to join averaged precipitation values to each municipality

I have precipitation data that I would like to average over each municipal unit in a boundary layer. First, how do I average the rainfall spatially by each administrative unit? Second, the rainfall ...
2
votes
0answers
12 views

QGis - WFS and joins

I'm trying to figure out whether it's just me, or if I'm forgetting a setting. I have a shapefile which I make available for WFS-requests. Now I added a join (to a MySQL table). I tried playing ...
0
votes
0answers
22 views

How to use calculatefield_management with ArcPy and joined second table? [duplicate]

How can I use calculatefield_management with ArcPy if I have a joined second table? I want to go through the attached table's field and I want to get records where the certain fields is. How can I ...
4
votes
1answer
1k views

How to Calculate Field in joined table using ArcPy?

I have to calculate a field based on another field in a joined table, but an error occurs: "Parameters are not valid. ERROR 000728: Field !Table_A.field_A! does not exist within table" My code: ...
2
votes
1answer
43 views

Difference between: join, merge and group

Suppose it is desired to make polygons A and B, and their respective attributes to be one unique polygon C. What is this GIS operation called? Is there any difference in GIS terminology about ...
4
votes
1answer
3k views

Joining polygons in R

I am wondering how to join spatial polygons using R code? I'm working with census data where certain areas change over time and I wish to join the polygons and the corresponding data and simply ...
0
votes
1answer
68 views

Join and Field Calculator

I made a Join between a shape and a dbf, and now I want to calculate some data from the table that came as a result from that Join. Everytime I try to run the Field Calculator it says there's an ...
1
vote
1answer
31 views

How to remove LayerName.FieldName join format in model builder?

I am running a join in model builder based on a calculated field in a geodatabase table and a created layer. After the join I am selecting features and copying selection to a new Shapefile. My ...