Questions tagged [unique-value]
A value, often of a variable, that is unique in the domain of consideration.
1
vote
0answers
14 views
Feature Class Unique Fields For ESRI Collector Survey
I have a suite of empty feature classes I use for ESRI Collector surveying. They are in a FGD. I want the PhotoID field in my Photos feature class to contain unique records, so fieldworkers don't keep ...
2
votes
0answers
40 views
Searching on the fly within buffer in QGIS
I am using "Unique Values" widget with "Editable" option in QGIS 2.18.3, for my "Name" field in POIs layer to eliminate spellings mistake.
"Unique Values" widget fetches all the distinct values in a ...
2
votes
2answers
354 views
Create attributes from unique values of another features classes category attribute with FME
I have a table (say landuse polygons for example) structured as follows:
ID | landuse_category
---------------------
1 | woodland
2 | industry
3 | farmland
4 | woodland
5 | lake
6 | farmland
7 ...
1
vote
0answers
75 views
ArcGIS Pro: How can I add layer effects to all Values with 'Unique Value' Symbology
I have a polygon feature class I want symbolized by a unique value attribute, in ArcGIS Pro.
Here is my example of this basic operation:
When I select one of these values, go to the 'More'-> 'format ...
2
votes
1answer
839 views
Unique List of Image Dates from Image Collection in Google Earth Engine
I would like to create a list or array object containing a unique set of dates represented in an image collection for a given region of interest. I have a function that extracts and converts dates for ...
0
votes
1answer
33 views
Subtracting unique values from different areas within the same raster
I have a raster of an area with various elevated features, situated on an overall slope. I want to normalize the elevations of each feature by subtracting the lowest elevation at each feature. This is ...
2
votes
2answers
584 views
How to run for loop with unique values
Instead of two shapefiles that are saved in fcList in this loop I would like to do KernelDensity on the unique values of one shapefile.
Does anyone have an idea how this might work?
import arcpy,os
...
1
vote
1answer
285 views
Unable to get Feature Layer to apply Unique Value Renderer in ArcGIS Javascript API
I am trying to make a unique value renderer on a map using the JavaScript API. I am using a layer that represents continents. I have used the samples and modified the code for my own layer, but I can ...
0
votes
2answers
926 views
Select features with same value in a given column
I first tried writing this post in generalities but realized it was more confusing that just giving the long version, so here goes.
I have a tree inventory that has property quads (in front of a ...
2
votes
2answers
138 views
ArcGIS 10.3 - Create/extract/summarize data from unique values symbology
I have a bunch of data symbolized by categories - unique values. I have grouped together many (10 to 40 per grouping) different values to create this symbology. Now I need to figure out the total ...
0
votes
1answer
43 views
Finding value of peer to peer pixel in another raster layer with same pixel size, coordinate and location from attribute table?
I have two raster layers with same pixel size, location, coordinate and time. I need to know what the value of defined pixel in one layer is in same location (pixel) in another raster layer.
The ...
4
votes
1answer
588 views
QGIS List Unique Values tool only exports to .html format
Using QGIS 2.16.2 I would like to export the unique values in a shapefile string attribute field to a new database table (which would contain a single field listing the unique values). The Vector > ...
2
votes
2answers
282 views
Seeking tool in QGIS similar to ArcGIS Combine?
I am wondering if there is a way/tool in QGIS (2.6) could produce similar output as ArcGIS "Combine" tool does. I am trying to integrate values from overlapping rasters, and then create a single ...
1
vote
1answer
182 views
PyQGIS QgsVectorLayer.uniqueValues() override active object filtering
This code snippet gives me the unique values for a vector layers attribute called myfieldname
l = iface.activeLayer()
attrIndex = l.fieldNameIndex('myfieldname')
uniValues = l.uniqueValues(attrIndex)
...
3
votes
1answer
288 views
Get unique values over multiple fields
For creating a legend of a map, I need to get a list of unique values over multiple attribute columns of a layer. I know how to get a list of unique values within one column - is it possible to get a ...
1
vote
1answer
87 views
How to rename unique value using arcpy
I work with several MXD files. In each map there a polygon layer with unique values:
I try to change in the table of contents the "a" into "land use" by using this code:
import arcpy,os,sys
from ...
1
vote
1answer
56 views
Unique pairs based on multi values
I will try to be as detailed as I can with the purpose and walkthrough of the situation.
I have 2 Feature Classes (fc1 and fc2).
fc1 is a polygon shapefile with no overlapping polygons and an id for ...
1
vote
1answer
107 views
Getting trouble with prefix clause for an ArcObjects Java query filter
I'm using ArcObjects/Java for ArcGIS 10.2.2 and I'm trying to get unique values of a field for a feature class.
Here's my current code:
List<String> values = new ArrayList<String>();
...
17
votes
2answers
2k views
Automatically style raster using unique values in QGIS?
In ArcMap, it is possible to automatically calculate the unique values for a raster and then apply a different style to each unique value (see 1st image).
However, in QGIS, I have to manually add ...
1
vote
0answers
182 views
arcpy symbologyType is always OTHER, but I need UNIQUE_VALUES
I am trying to load a TIF file to the mxd using arcpy, then add a definition file to map colouring.
For one layer I have the problem, that the amount of values will always be different, sometimes it ...
2
votes
1answer
89 views
How do I create a layer with popups that has hundreds of unique markers/symbols?
I am creating a layer in ArcGIS JavaScript API.
I am looking for the best way to have a feature layer with popups and unique markers.
This layer has hundreds of markers at a time.
The markers are ...
2
votes
1answer
401 views
Convert raster to polygon
Using ArcMap 10.3, I want to digitized only the pale blue polygons in the raster into shapefile with "Raster to polygon" tool. This is the raster:
I get a shapefile with gridcode field, but i don't ...
2
votes
1answer
738 views
Copy first row of attributes and paste for each feature
In a newly digitised polyline vector layer, there are 7 columns attributes value that are choosen inside a value map combo-box that MUST be exactly the same for every newly digitised line (I choose ...
7
votes
3answers
4k views
How to find unique values of an attribute with python in qgis?
i look for solution to get the unique values of an attribute of a vector layer. what is the best way in python qgis to get the unique values of one distinct attribute? I work with qgis 1.8.0.
