All Questions

0
votes
1answer
12 views

Using Ground Control Points in Agisoft Photoscan?

I'm fairly new to the Agisoft Photoscan program, but I am trying to build several models using aerial imagery and highly accurate GCPs, with coordinates collected in the field. I align my photos and ...
2
votes
1answer
26 views

Transform CRS of Shapefile in R

I started with an AutoCAD DWG file and used FME Workbench to extract elevation data into a shapefile. read_sf yields: > shapename Simple feature collection with 41620 features and 1 field (with ...
2
votes
2answers
143 views

Apply Line Pattern Fill to LineStrings?

I am trying to print out a network map using black/white hatching patterns, similar to Black/white hatching pattern fills in QGis but for Lines. Is there some trick I can use?
-1
votes
1answer
41 views

Taking data from a CSV file to create points on a shapefile

I am trying to import data from a CSV file and write a script that will generate points on a new shapefile. I am running into issues for when I try to update the InsertCursor. I get an error of "not ...
0
votes
0answers
11 views

Writing Custom Label Expressions using Arcade for ArcGIS Online? [on hold]

I'm not familiar with Arcade, but I'm trying to do a simple expression. I need to write an if-else label expression that will label addresses by their address number, unless there is a address unit ...
0
votes
0answers
12 views

Jason-3 Data Mapped in ArcGIS

Has anyone figured out an easy way to convert Jason-3 data in NetCDF format to a GIS format (raster, shapefile, etc.) so it can be viewed in ArcGIS? Jason-3 data is available for free in NetCDF format,...
0
votes
0answers
12 views

XML to TIFF raster and zonal statistics in QGIS

I was sent several XML files of a flood model's peak extent that works fine in ArcGIS, I need to use zonal statistics, and I don't have that available in my workplace's ArcGIS subscription, so I need ...
1
vote
0answers
13 views

Emitting map click using ArcGIS API for JavaScript?

I am trying to emit a map click from the MapView object using its emit method. I have successfully done this in the 3x API from the Map object. This same method, however, is not working for me in the ...
1
vote
0answers
10 views

QGIS quit unexpectedly

Running QGIS 2.18 on Mac OS 10.14. Python 2.7 and GDAL 2.1 installed. Trying to clip raster by polygon. (raster--> extraction --> clipper) Get error message. ("qgis 2.18 clipper The process failed ...
0
votes
1answer
26 views

How can I export multiple, consistently sized raster files?

I'm working with a computer that uses multiple ASCII raster files and ran into an issue with the file alignments. As you can see in ArcMap, the rasters are being aligned correctly. However, upon ...
0
votes
1answer
19 views

Adjusting symbology in layer file?

I have a layer file for a geology layer containing attributes for "Age", "Rock Type" and "L_Code". The layer has symbology defined using the "L_Code" attribute. But I want the same symbology applied ...
1
vote
0answers
9 views

Cannot find Grass7 folder in QGIS 2.18 content folder

I have freshly re-installed QGIS 2.18.28 in the prescribed order. I was under the impression Grass7 in included in one of the install packages. But when trying to point QGIS to the grass7 folder under ...
0
votes
1answer
33 views

Is saving rasters to VRT bad convention?

I'm working with a lot of rasters (dozens of thousands) and would like to store them for a while. They will be used intermittently, but never all at once! The size of VRT (~2 kb) is such a positive ...
1
vote
1answer
45 views

Raster Volume Returning Wrong Volume

I have a clipped surface using Washington State Plane North (feet) added to a QGIS project using the same CRS. I am trying to calculate the area under this surface (a dirt pile) using SAGA Raster ...
0
votes
0answers
6 views

VeloxRaster_crop returns numeric

Curious as to why the following only returns a numeric vector with row and column information rather than a cropped raster: ras <- velox("dir.tif") cty <- st_read("cty.shp") ras <- ras$crop(...
1
vote
1answer
38 views

How to split vector layer in PostgreSQL/PostGIS

QGIS has this nice tool to Split a layer into multiple layers based on one attribute and create a new layer for each unique value within that attribute. Is this also possible using PostgreSQL/PostGIS?...
-1
votes
1answer
21 views

Working with Raster data/DEM (mosaic to new raster, viewshed) in ArcGIS Desktop?

I'm trying to work with raster data from this source: http://www.soest.hawaii.edu/coasts/data/maui/index.html I downloaded the DEMs from different islands and imported them into ArcGIS. But I can't ...
2
votes
1answer
74 views

How to use QgsRasterInterface.histogram?

This is really a question of how to better understand QGIS API documentation (C++ or Python) but I'll use this example: How do I use QgsRasterInterface.histogram? I was told in this thread I can use ...
0
votes
0answers
9 views

Open NITF containing multiple images using Python GDAL

I have a file in NITF 2.1 format, which contains multiple images within it (in ENVI speak "image segments"). But with Python's GDAL, opening the file only gives me access to the first image. How can I ...
0
votes
0answers
9 views

Providing multiple inputs to Create TIN tool in ArcPy?

The documentation has a field where you can list the name of your shape, the field, and other variables, but does not give examples of multiple features. The standalone tool supports multiple features....
1
vote
0answers
17 views

Controlling field names with arcpy.Combine?

If I run the arcpy.Combine command as such: result = arcpy.Combine(["CDL/raster07", "NHD/raster07", "OtherRaster"]) The resulting raster has an attribute table with fields [f.name for f in arcpy....
0
votes
0answers
5 views

Combining a vector layer with a Raster layer Geotiff orthomosaic and contour/Shp file

I am attempting to do the same as @shub but when I do the above process "Bring in a shapefile of your contours and make sure they have an elevation attribute with them. Go to Raster > Conversion > ...
0
votes
0answers
13 views

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

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
votes
1answer
26 views

Auto Incrementing Field based on Selection of Records in Feature Class?

I'm attempting to write a script that will add an incremented value to a field based on a selection of records. For example, the script will select the first 300 records in a feature class and then ...
0
votes
2answers
15 views

Geoviews Attribute error

I just installed GeoViews with success and I tried to follow one example at the first page of their site and this already gave me an error. In fact, there are two errors of the same type that occurred ...
1
vote
1answer
26 views

Using GDALwarp for reprojecting netCDF file?

I am trying to re-project a netCDF file using the gdalwarp command. However, the gdalwarp is giving me a black output. Below is my code: import gdal import osr import netCDF4 from osgeo.gdalconst ...
1
vote
1answer
27 views

Error after loading new plugin Qgis 3.4

In Qgis 3.4, after creating a plugin with plugin builder, compiling it with pb_tools, I still can't load it to Qgis. I keep getting the following error message: "Couldn't load plugin 'test_api' due ...
0
votes
0answers
24 views

How to get a 1m precision coordinates?

I'm working on a project which examines different approaches for indoor positioning. All of these approaches return coordinates (lat/lon). What I need to do is create a digital map to compare returned ...
0
votes
1answer
25 views

Installation of QGIS 3.4.4 on Ubuntu 16.04 fails to install qgis-plugin-grass because of uninstallable grass760 dependency

I have used the instructions here marked Tested 29/06/2018 to install QGIS 3.4.4 on Ubuntu 16.04. While QGIS installs nicely I get an error on installing qgis-plugin-grass. Subsequently the Grass ...
2
votes
1answer
22 views

Isolating and exporting specific sections of a shapefile in QGIS?

If I have a shapefile layer in QGIS showing the spatial boundaries of subsections of a larger area (e.g. counties within a state, or countries within a continent), how would I selectively crop out one ...
0
votes
1answer
27 views

Creating new layer/shapefile from each element using ArcPy?

How can I create a new layer (shapefile) from every element in another layer? I have point shapefile 'przystanki.shp' (in Polish mean bus stops) with 19 point and some attributes in table. What i ...
2
votes
0answers
24 views

Displaying Legend for Variable Width Line in QGIS

I am using QGIS v3.4 to display a simple line as a line of varying width using the variable line width attribute facility of QGIS (please see screenshot below). The layer displays correctly within ...
3
votes
1answer
25 views

Converting from custom projection northing/easting coords to lat/long in decimal degrees

I've got a custom projection file that's applied to all data (per request of a client), and another team is requesting ids/coordinate pairs for assets. I tried ripping out X/Y off the point data, but ...
0
votes
1answer
19 views

Using compareRaster (rasters): different extent? [on hold]

In R I'm trying to make a RasterStack of RasterLayers, they all have the same format, the only difference is that one of them is a solo raster and the others are bioclimatic variables. The soil layer ...
2
votes
0answers
17 views

QGIS globe map - label distortion [duplicate]

I have created an azimuth orthographic projection map (basically a globe, I've used this custom CRS: +proj=ortho +lat_0=51.470129 +lon_0=-0.452751 +x_0=0 +y_0=0 +a=6371000 +b=6371000 +units=m +no_defs ...
0
votes
0answers
15 views

Exporting Shapefile polygons from ArcGIS Pro to OpenStreetMap

I recently worked on a project that digitized a lot of building footprints and swimming pools with high-resolution orthorectified imagery (~4 inches resolution). The polygons are all in shapefile ...
0
votes
0answers
16 views

gdalwarp : I lose some pixels when I crop

My problem: When I crop with gdal gdalwarp -te minX minY maxX maxY input_raster.tif output_raster.tif I expect an output shape of (maxX - minX, maxY - minY) = (10980,10980) BUT : I get an output ...
0
votes
0answers
12 views

Connecting to geodatabase in ArcGIS Pro? [on hold]

Could anyone post some code that explains how to connect to any geodatabase using ArcGIS Pro SDK? Or connect to a place where you would create a database? I am creating a tool in Visual Studio but ...
0
votes
1answer
38 views

How would one sum multiple image outputs in earth engine?

I am doing some GDD data analysis for a project and am having trouble coming up with a way to effectively analyze a specific time of the season over multiple years. What I am trying to do is find ...
0
votes
0answers
25 views

Units of curvature output in ArcGIS 10.x and Pro

This question has been asked several times, but I am not sure that there is a satisfactory answer. I have used ArcGIS Pro to calculate curvature from a DEM. Now I am not sure what the units are in ...
1
vote
1answer
37 views

Calculating minimum distance in meters of two polygons (defined in lat/long coordinates)?

I'm new to GIS and I'm a bit lost in the terms and concepts, so I'm not sure I'm asking a valid question, but I need to calculate the minimum distance (in meters) of two polygons which are defined in ...
1
vote
0answers
16 views

QGIS3 difficulty drawing 150km distance buffer and showing this on the map

I wanted to construct a 150km distance buffer around a city in North America. I changed the project co-ordinate system of the point to WGS84 Mercator North America from WGS 84 Lat/long to enable the ...
0
votes
0answers
8 views

Exporting images to Google Earth Engine? [on hold]

I need to export image from Google Earth Engine to Shape but I get this error: Error: Invalid property type: Property system: bands has type Element.
0
votes
1answer
13 views

Matching my shapefile to a DGN that has an unknown projected coordinate system?

I was asked to pull the 2-foot contours from Aiken County in South Carolina (http://www.dnr.sc.gov/GIS/lidarstatus.html) and send them to a person working in Microstation to match the scale and ...
-1
votes
0answers
13 views

Importing data into R .flt? [on hold]

I was trying to do everything but my formula is still not working. mydata <- read.table("\\aaaaa.net\Finance_01$\NUC\Warsaw\20190416\20190416_MLT.flt", header=TRUE, sep="|") Error: '\F' is an ...
1
vote
1answer
26 views

Invert legend values for raster in QGIS 3.4.6

The legend in the TOC for a raster layer ( > 1 million cells with continuous data) in my view might look like this: The values go from low (above) to high (down). Is there a way to show the values ...
0
votes
0answers
11 views

Spatial Join on single feature class returning zeros

I am attempting a spatial join in ArcMap using the spatial join tool to count identical overlapping polygons in the same feature class. I have run this analysis a number of times without problem. ...
3
votes
1answer
67 views

Using libraries other than PyQGIS to develop plugin for QGIS?

I develop a plugin for QGIS. Before to integreted it in the QGIS I developped it with GIS library (Fiona, shapely, geopandas, ...) and it work well. Now I try to build it with plugin_builder of QGIS. ...
-1
votes
0answers
11 views

How to make an Excel sheet from TIF raster layers using QGIS? [on hold]

In this file you will find how a midterm grades were announced to students so every student could get his grade using his section no and bench no.. The midterm contained Q1 which was 50 MCQ and every ...
0
votes
0answers
20 views

Auto filling column using ArcPy? [on hold]

I need to fill automatically the column "CoeffQté" with the result of the previous columns. Like this way CoeffQté = column 3 * column4 This is an image of the input table . How can I do this? what ...

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