Questions tagged [unique-value]

A value, often of a variable, that is unique in the domain of consideration.

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Finding the overlapping points frequency table [closed]

I have a point feature class in ArcGIS that represents the registration location of each car. I need to find the frequency of cars at each Lat/Lon and create an output table which has three columns of ...
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32 views

ArcGIS Pro Unique Values with Domains Does not Display Correct Number of Classes

This post may be overkill, but I'd like to see if anyone else has run into this and if they have a fix. I'm trying to get ArcGIS Pro (2.9.2) to symbolize linework where three fields use a domain (0=...
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How to create a list of unique strings, and print that list in a field using ArcGIS Pro field calculator

I have a landcover polygon that I spatially joined to a soils polygon. This left me with many duplicate soil types in each row of the landcover polygon. I would like to summarize the soil types to ...
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3 votes
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number the soil_unit_code in a soil_id column

I believe its pretty easy to be done, but I just don't seem to see the solution in Qgis. Is it possible in the field calculator? I've an attributetable with 200 features with like 20 different ...
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1 vote
1 answer
740 views

How to "Save symbol to style" for layer with Unique Values style in ArcGIS Pro 2.8?

I'm new to ArcGIS Pro and this process is really easy and straightforward in QGIS but ArcGIS Pro seems to be complicated everywhere. I just want to save the symbology of this counties layer which ...
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3 votes
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Finding all unique values in categorical image

I'm using GEE and I would like to get all the unique values of a raster in a specific region. My raster is uploaded to EarthEngine as an Image and I would like to sample only the first band. Which ...
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7 votes
5 answers
664 views

Counting values of each classification code using QGIS

I feel like this is an easy fix, but I'm struggling to just get a count of how many attributes I have for each value in a certain column for an Attribute table. I have a column of landfire ...
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2 votes
1 answer
39 views

Export one point with shared origin value in attribute table

I am trying to find a way to export unique points from a pointlayer in QGIS. Using the tool ‘Extract vertices’, I generated corner points from polygons in the input layer (first image). I now only ...
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3 votes
3 answers
157 views

QGIS - ValueMap with custom value input

Is there a possibility in QGIS to populate a ValueMap-like form widget with predefined data and additionally offer a possibility to fill in data (that might be missing) manually? Like an editable ...
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Cannot see or classify weighed overlay or weighted sum rasters using ArcMap

I ran weighed overlay and weighed sum on a suitability analysis in a model. neighther one is visible when added to display. The weighed sum values are also suspect (first pic). I go to properties, ...
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3 answers
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Naming polylines in sequences from left to right (west to east) using QGIS

I would like to give each of these polylines an "ID" e.g. 1,2,3,4 etc. from left to right (West to East) or more accurately off a bearing of 125°. How can I achieve this in QGIS? Data: https:...
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How to create polygon automatically with coordinates [duplicate]

I have some bunch of points in an area and I want to draw connecting lines with the help of points to create a closed polygon. But all these needs manual efforts. Can any one explain to me how to ...
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Getting unique values from multiple fields as matched using PyQGIS

There are "Code" and "Color" fields in my layer like this: (Sample 6 rows) Code Color A Red B Blue A Red A Red B Blue C Green All As are Red, all Bs are Blue and so on. I ...
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Nearest unique duplicate points

How can I highlight nearest(certain distance) unique duplicates? Actually I tried a process in ArcGIS but only duplicates are pulled out from the entire file without considering distance. How can I do ...
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9 votes
2 answers
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Adding auto incremented value to existing ID

I am having a table where two columns are "ID" and "maintenance_ID". The "ID" column is unchangeable and comes from another table but the "maintenance_ID" is ...
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Adding consecutive unique ID for distinct value sets and sorting by date [closed]

I have a layer with features, which have a unique ID, called "Object_id". A second column is "Date", a third called "info" (see below). What I need is to fill the fourth ...
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Make Feature Layer / Select / Select Layer By Attribute "Get Unique Values" grayed out in ArcMap ModelBuilder [10.8.1]

I'm trying to extract road segments from a feature class through ModelBuilder in ArcMap 10.8.1 based on attribute queries, but the "Get Unique Values" button does not pull up a list of ...
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4 votes
2 answers
951 views

Getting unique values in a QGIS Expression

I'm using QGIS 3.4 attribute form to edit the widget type. I'm trying to retrieve "cab_no." field values (only unique values) from 'U_Cabinet' layer to use it in "fdt#" field in ...
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3 votes
2 answers
642 views

Export Table of Unique Values by Field

I get a lot of shapefiles with no metadata. Grrr. Often there are tons of table columns (fields) with no description of what the column is for or what the coded values mean. Is there an easy way to ...
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Mapping multiple categories that overlap, but cannot get layer to appear on top consistently ArcMap 10.5

I am trying to map overlapping practices using unique values in ArcMap 10.5. I have a practice for planting and practice for site prep. Planting is a solid fill blue but for some reason the prep ...
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3 votes
1 answer
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Keep unique names of places

I have a map and I want to create a label with the unique names of places. Meaning a province may have a lot of polygons but I only want to keep one of these polygons' name (the main or biggest one is ...
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Duplicate and triplicate values in raster symbology for Unique Values using ArcMap

I'm using ArcMap 10.7.1 on Windows 10 to symbolize some rasters. Looking at the the unique values, I found duplicates and even triplicates using the Symbology window (see picture). There are about ...
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1 answer
352 views

Counting unique species in polygon layer and buffer

Within QGIS I'm working on a data set that contains species at 100m resolution (eg OSGB 6 fig) and 10m or finer resolution (eg OSGB 8 or 10fig). The objective is to count the number of unique species ...
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Unique values from Kernel Density

I have calculated Kernel Density for feature class "fc" using following code: dens = KernelDensity(fc,"NONE", 1, SearchRadius, "SQUARE_METERS", "DENSITIES", "PLANAR") The raster attribute table: I ...
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1 vote
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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 ...
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2 votes
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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 ...
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5 votes
3 answers
2k views

Deleting features with identical table attributes in QGIS

How do I delete features with identical table attributes in QGIS? Otherwise, is there a tool like the 'Delete Identical Tool' in ArcGIS? For example, if I had 4 rows, and 3 columns, where I wanted to ...
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3 votes
2 answers
2k 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 ...
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1 vote
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121 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 ...
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3 votes
2 answers
5k 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 ...
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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 ...
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2 votes
2 answers
4k 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 ...
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1 answer
709 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 ...
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2 answers
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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 ...
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2 votes
2 answers
291 views

Creating/extracting/summarizing data from unique values symbology using ArcMap

I am using ArcMap 10.3. 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 ...
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1 answer
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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 ...
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5 votes
1 answer
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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 > ...
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3 votes
2 answers
694 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 ...
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1 vote
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438 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) ...
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3 votes
1 answer
665 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 ...
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1 vote
1 answer
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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 ...
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1 vote
1 answer
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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 ...
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1 vote
1 answer
153 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>(); ...
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17 votes
2 answers
4k 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 ...
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1 vote
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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 ...
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2 votes
1 answer
102 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 ...
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2 votes
1 answer
854 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 ...
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3 votes
2 answers
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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 ...
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  • 251
7 votes
3 answers
6k 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.
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