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1500 questions
19
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6 answers

Is it possible to georeference an existing, un-georeferenced pdf?

I was wondering if there was anyway to georeference a pdf directly without first converting it to an image. I have access to ArcGIS 10.1 but haven't been able to find any information that would indicate it is possible. I am willing to try other open…
Sarah
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6 answers

Is PhD in GIS useful in non-educational career path?

A bit of an open debate - I am curious for your opinions. I am considering commencing a PhD in GIS which may concern the application of surveys within the natural environments. Eventually, I wish to continue my career in professional consultancy and…
Mandy
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19
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3 answers

Generating GeoJSON with Python

I want to programmatically create a GeoJSON file using polygons from a shapefile but adding attributes from my own application. This is easily done for a shapefile: def create_data_dayer(self,varlist, data): """ Creates a new shape to…
fccoelho
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19
votes
5 answers

Comparing two geometries in ArcPy?

I am trying to compare two separate feature classes to identify differences between them (sort of a diff function). My basic workflow: I extract the geometries using a SearchCursor Save the geometries of the two feature classes as GeoJSON using a…
Michalis Avraam
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19
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2 answers

Viewing or importing *.pbf file (OSM data, binary format) in ArcGIS Desktop or QGIS?

How to view or import a pbf file (OSM data,binary format) in ArcGIS Desktop or QGIS? Are any 3rd party applications needed? I would like to edit this file on any GIS Software.
Anand
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19
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3 answers

Determining what lines have changed in updated shapefile using QGIS

I am using my county's GIS data to update the roads in OpenStreetMap. I have a copy they published last year and one that was just published, and I would like to find all the LineStrings that have either had their attributes or their geometry…
joshdoe
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19
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3 answers

Difference between Albedo and Surface Reflectance

Can anyone tell me what is the difference between Albedo and surface reflectance? I know for sure that they are not the same. Any links / comments are most welcome.
GBh
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19
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2 answers

Adding custom feature attributes to shapefile using OGR in Python

I am seeking a way to take an existing Shapefile that has a Feature set of 200 countries. Each country Feature has an attribute of "NAME." My objective is to create a Python script that adds an arbitrary (for now) additional attribute, say,…
mattdeboard
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19
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3 answers

Colorizing polygons based on color values in dataframe column?

I preparing some choropleth election result maps in Geopandas. The assigned color for each electoral district must correspond with the winning party (a color that I pre-determine), and the intensity of the color (opacity, saturation, etc) must be…
mattchewy
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19
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7 answers

Splitting polygon into equal area polygons using QGIS

There is a Plugin in QGIS 2.18 called "Polygon Divider" which divides an irregular polygon into smaller equal-area polygons of a specified/custom-sized but in QGIS 3.x version there is no "Polygon Divider" Plugin or tool to perform that task. How do…
Kapildev adhikari
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19
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2 answers

Creating multiline labels in QGIS

How can I apply Multiline label option in the label property? Name field contains a lengthy name. I want to wrap it. My QGIS version is 1.8.
Sreesha
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19
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3 answers

Alternative vegetation indices

I have been using NDVIs with limited success to identify trees in the central Great Plains region of the USA. The problem I have been encountering is that reflectance from farm fields/pastures have essentially the same spectral signature as the…
Aaron
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19
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1 answer

Importing polylines and polygons into QGIS from CSV

I want to import a large number of polylines and/ or polygons into one one or more QGIS layers in order to plot the data. Each will only have simple attributes (e.g. name). I need to know: The required format of the CSV file to enable step…
Tim Fowler
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19
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1 answer

How can I superimpose a geopandas dataframe on a raster plot?

I have a geopandas dataframe countries with country polygons, and a raster dataset raster (read with rasterio). I've already aligned the two as follows: countries = countries.to_crs(raster.crs.data) I can see they're aligned when I plot each…
mitchus
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19
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3 answers

How do I change geotiff "no data" color to white/transparent rather than black?

I am preparing data for inclusion into a geonetwork node, where the maps are displayed via geoserver. The problem is that cells that have"no data" are displaying as black in the geotiff and I am would like the color to be set to white or…
enmapping
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