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Questions tagged [frequency]

The tag has no usage guidance.

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0answers
17 views

Determine the most frequent value for an attribute based on another attribute [closed]

I need to determine the most frequent value of one attribute based on another. For example: Field 1 Field 2 Cat Tabby Cat White Cat White Dog Brown Dog ...
0
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1answer
35 views

Pivoting Tables and using Frequency in ArcGIS Desktop?

I have a points layer of specimen samples. They have a field called "RESULT" which is a string field containing the results of a test, "Positive" and "Negative"(you can only see negative in the pic ...
1
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1answer
39 views

How to get a frequency matrix of overlaying raster values?

as I couldn't find any solution for this, I ask for some ideas for my problem on this platform: I have two raster datasets (a World Soil Map and Global Horizontal Irradiance), which I merged together ...
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0answers
26 views

How to find frequency of a field based on another attribute?

I'm working in ArcMap. I have a list of people and the states that they live in. Small Example: I want to know what is the most common name in each state. I thought I would use the frequency tool ...
8
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2answers
342 views

Equal Time Maps for Transit Network (Isochrones) on QGIS

I am on a committee looking to redesign transit service in Sacramento and need to be able to make equal-time maps or "isochrones," like the attached. A prominent difference between transit isochrones ...
2
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1answer
92 views

Counting frequency of specific value in selected columns of an attribute table of the feature class in ArcGIS 10.4

I want to calculate the number of members in the houses (feature class which contain information of the members in the house interms of age,sex,occupation) based on the information entered in age ...
5
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2answers
6k views

What is a GPS epoch?

What is a GPS epoch? I encounter this often in technical discussions and it does not have a clear meaning to me. Lately it was used in this post and it seems to mean the receiver update rate (the ...
0
votes
1answer
600 views

Reclassifying NDWI using Google Earth Engine?

I'm trying to reclassify a NDWI raster into 1 for values >0.4 and 0 for <0.4. I understand that its possible to use .remap in case of discrete values, but not sure how to reclassify NDWI raster ...
2
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3answers
94 views

Creating buffer based on occurrence frequency using ArcGIS Desktop?

I am using ArcMap 10.4.1. I have several point shapefiles containing different occurrence data for two different species of flower (from multiple sources, hence the multiple shapefiles). I want to ...
0
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2answers
202 views

Zonal histogram completed but no output created

I am trying to obtain zonal histogram data for about 10 000 statistical sectors in Belgium. So I have a shapefile containing these polygons. I also have a value raster which has been reclassified : ...
1
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1answer
281 views

Large raster frequency table / counts

I try to calculate the frequency/count of pixel values of a raster in R using freq(). library(raster) RastSmall <- raster(nrow=70, ncol=70) RastBig <- raster(nrow=7000, ncol=7000) set.seed(...
0
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1answer
382 views

Reassigning Raster values to new values in QGIS?

For example, if the Raster has integer values ranging from -1 to 3 and the value that I am only interested in is 3, I then want to assign values -1 to 2 to 0 and then have the 3 value set to the value ...
4
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1answer
1k views

Create frequency polygon from overlapping features in another polygon

Mac 10.9.5; QGIS 2.8.4-Wien; history and unioned data, in GDA94, zone 55 here. I have a polygon of fire history with a number of overlapping features. I want to create a new polygon for fire ...
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1answer
2k views

How to extract all pixel values in a raster file [duplicate]

I have a image difference from ArcGIS, which i have performed a remap function on. The layer is a temporary layer and does not have an attribute table, i need all the pixel values to do a frequency ...
0
votes
1answer
289 views

ArcGIS frequency analysis tool

Will the ArcGIS frequency analysis tool work on a shapefile's attribute table or does it only work on a discrete/standalone table loaded in a mapping session? Have loaded a geolocated address book ...
2
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1answer
531 views

Proper Use of QGIS tool: “Frequency analysis”

Trying to use the "Frequency analysis" tool in a script but getting errors. The Online documentations for this tool: processing.runalg('qgis:frequencyanalysis', input, fields, output) My Script: ...
1
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1answer
342 views

Batch frequency of point groups to single table in ArcGIS Desktop? [duplicate]

I'm new in the GIS world. I have a bunch of points (around 40,000), which are split in categories (1 to 9) and have a field which specifies their membership to a polygon (~50) (e.g, 30, which would ...
5
votes
1answer
5k views

Recording frequency of names in the attribute table?

I have a question with ArcGIS 9.2. In an attribute table the column [name] includes the name of every place in this layer. Next to that (in columns [numbers]) there should be recorded how often a ...