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Geographic Information Systems

Questions tagged [values]

The tag has no usage guidance.

16 questions
info newest frequent votes active unanswered
0
votes
1answer
20 views

Making the results from function a string [closed]

I am trying to get the features count from feature, then put it in a dictionary that I can call later: ct_dict = dict() ... fipsList = ['13245','06007'] for fip in fipsList: mergedJoinCentroids =...
1
vote
1answer
68 views

Get pixel values from a raster using a multipartpolygon

I'm trying to get the mean value of pixels from an NDVI raster, that intersect the geometry of a FeatureCollection, that is a multipart polygon which represents my sample area, but I can't find the ...
0
votes
2answers
73 views

PostGIS: Change raster values depending on values from other raster

I have two rasters and I want to change all the values from "raster1" to 4, where they are larger than the values from "raster2" and to 0, where they are smaller. So raster2 has only one value, which ...
1
vote
0answers
98 views

Polygonizing distinct values using QGIS?

I am using QGIS 3.0.3 and I am trying to create simulated data through two sets random points distributed along two gradients of values (photo below). Using the raster calculator I created two ...
0
votes
1answer
61 views

Null values being interpolates as 0 in QGIS

I have a file with data fields which I have imported as CSV. When I look at the Field Attribute Table, the empty fields appear clearly as NULL values. However when I interpolate the data, the NULL ...
1
vote
1answer
81 views

How do you return a set of unique pixel values in a raster with pyqgis? [closed]

I am trying to test whether a value exists in a raster against all the values present. I am using pyqgis (Python 2.7) in in QGIS 2.14. I have found a number of ways to get point location values and ...
1
vote
1answer
29 views

ArcMap correct Errors in Attribute Table

I want to replace the all the -9999 values in my attribute table with 0. Does anyone know an easy way to do this?
3
votes
1answer
196 views

Extracting Z-Values from SHP with geotools and vividsolutions?

I use the java libraries geotools and vividsolutions to extract xyz data from a shapefile (Vienna from this example). This works perfectly fine for x and y data, but all coordinate values for z are ...
3
votes
1answer
51 views

Creating buffers with values, and finding areas with high value overlap of these buffers

I'm working on a project where, essentially, I'm measuring threat levels based on geospatial patterns. I have different groups with higher or lower threat levels based on the distance from their ...
0
votes
0answers
34 views

File Geodatabase: storing text in an integer field?

I recently downloaded a FGDB from NOAA at https://marinecadastre.gov/ais/ The FGDB contains a point feature class with ship locations. One of its attribute fields, named [Status], is of type Long ...
0
votes
0answers
150 views

Expression to filter attributes by date using “Ask for values”?

We are setting up to deploy a solution across our organization and one thing I need to add is a filter/slider for date ranges in the "Manager" window of AGOL. I have admittedly little to no experience ...
0
votes
0answers
48 views

Converting feature to raster, missing values

I have converted many features from the same shapefile to rasters, but am now getting an issue where values are missing. Converting the percentage values in column a212 (data type long) produces a ...
1
vote
0answers
63 views

Problem with the attribute table values, they are replaced with ************

I suddenly have a problem with my attribute table. When I change a value the whole line is messed up because values shift and the value I add is replaced by ***********. How can I avoid this from ...
1
vote
2answers
68 views

Correlating number values with text values from different fields in ArcMap?

I need to create a vector layer for representing the geology of an area. I have the geological map, a raster file. I made some polygons and I named them in the attribute table, but I don`t want to ...
7
votes
1answer
725 views

How to create predefined values in a field in PyQGIS?

I would like to make by programmation (python) the same thing than we can do directly in QGIS when you create a list of values for a field. I would like to create a new field and specify a list of ...
3
votes
1answer
391 views

Setting a default value in a QGIS creates empty field

I use Qgis 2.18.3 and tried to set default values in new column in a existing shapefile via the layer properties as described here: Setting a default value in a QGIS field or here How to set a default ...