Join us in building a kind, collaborative learning community via our updated Code of Conduct.

Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. Join them; it only takes a minute:

Sign up

Here's how it works:

Anybody can ask a question
Anybody can answer
The best answers are voted up and rise to the top

Top Questions

active 3 featured hot week month

4

votes

4

answers

210

views

Problems with for iteration in arcpy

arcgis-desktop arcpy shapefile python-script-tool iteration

modified Jul 19 at 8:42 MikV89 53

1

vote

5

answers

302

views

Map display not filling window in QGIS on Mac?

qgis mac qgis-3.2

answered Aug 9 at 17:40 clint 11

8

votes

1

answer

152

views

Creating a 'brick wall' style for polygons

qgis style qml

modified Aug 7 at 19:35 csk 4,655

5

votes

2

answers

318

views

Creating graduated point circles in ArcGIS Desktop?

arcgis-desktop symbology color-ramp

modified Aug 2 at 22:16 PolyGeo♦ 51.6k

3

votes

5

answers

95

views

Count of the different combination of two attributes in QGIS?

qgis field-calculator count cross-tabulation

modified Aug 8 at 7:52 Jochen Schwarze 5,420

3

votes

4

answers

86

views

Interchange y, x to x, y with geopandas (python) or QGIS

qgis python shapely geopandas

modified Aug 1 at 21:33 Mike T 29.8k

4

votes

3

answers

163

views

Changing data display language on QGIS?

qgis labeling internationalization label-expression

answered Aug 10 at 18:13 Kelly 1

2

votes

4

answers

183

views

Determine if a polygon is not enclosed by other polygons

qgis postgis fme

modified Aug 7 at 19:26 Mark Ireland 8,945

3

votes

1

answer

82

views

Seeking GIS that can calculate fractal dimensions?

software-recommendations

modified Jul 31 at 13:54 gisnside 5,162

3

votes

1

answer

104

views

Remove yellow upgrade footer in QGIS 2x

qgis-2.0

answered Jul 31 at 4:46 Kadir 3,181

3

votes

4

answers

94

views

Concatenating address fields with possible blank or null values in fields using Python parser?

arcmap field-calculator python-parser concatenation

modified Aug 4 at 18:54 BERA 10.3k

1

vote

2

answers

96

views

Understanding why Split Polygon tool is greyed out?

arcgis-desktop arcmap arcgis-10.3 editing

modified Jul 18 at 19:45 Christine Salvadore 86

3

votes

1

answer

123

views

Real centroid plugin QGIS3

qgis qgis-plugins qgis-3.0 centroids

modified Jul 25 at 18:43 csk 4,655

2

votes

1

answer

184

views

Access vertices of a line in Python

line shapely linestring vertices

modified Aug 10 at 18:32 BERA 10.3k

3

votes

1

answer

142

views

What file format has 18n, 18g and 18o file extensions?

qgis convert gps format files

modified Jul 26 at 18:05 GeoSharp 2,938

2

votes

6

answers

77

views

How many CRS / EPSG codes are there?

coordinate-system

modified Aug 11 at 0:10 Mike T 29.8k

2

votes

2

answers

120

views

Applying categorized symbololgy to many layers using QGIS?

qgis symbology

modified Jul 24 at 21:38 PolyGeo♦ 51.6k

1

vote

1

answer

154

views

QGIS degrees to meters

qgis coordinate-system

modified Jul 31 at 10:23 Ian Turton♦ 43.8k

4

votes

2

answers

81

views

Generating random points inside raster boundary using R?

raster r random

modified Aug 7 at 22:58 PolyGeo♦ 51.6k

5

votes

1

answer

87

views

Creating new Half-Inch Bartholomew-Style Maps in QGIS 2.18?

qgis style

modified Aug 5 at 18:39 Steven Kay 15.8k

1

vote

1

answer

87

views

Shapefile to GeoJSON with simple style

shapefile geojson symbology export

modified 12 hours ago nmtoken 7,436

0

votes

2

answers

67

views

What does 4.5 mm resolution mean?

imagery image resolution

modified Jul 22 at 10:47 Lau 40

3

votes

2

answers

67

views

TAB (MapInfo) Attribute Data not Imported to shapefile using QGIS?

qgis shapefile attributes tab

modified Jul 31 at 9:01 Volta 569

3

votes

1

answer

108

views

What's the difference between using PostGIS functions and operators?

postgis postgresql

modified Aug 6 at 14:51 RoVo 4,314

5

votes

1

answer

80

views

Creating Vector MBTiles?

postgis postgresql openstreetmap mapbox vector-tiles

modified Aug 10 at 9:22 PolyGeo♦ 51.6k

4

votes

2

answers

78

views

Uploading Geopackage contents to PostgreSQL

postgis postgresql ogr ogr2ogr geopackage

answered Jul 25 at 9:19 Stev_k 4,909

1

vote

2

answers

99

views

Joining several fields into single field using ArcPy?

arcpy cursor

answered Aug 9 at 18:57 Daniel Guerrero 8

-3

votes

1

answer

121

views

Merging netcdf files into one using R?

r netcdf grads

modified Jul 30 at 11:41 PolyGeo♦ 51.6k

0

votes

3

answers

73

views

Increase spatial query performance (st_difference)

postgis erase st-difference link cartesian

modified Aug 1 at 14:27 Pil Kwon 342

2

votes

2

answers

53

views

How do I execute a field calculation on just selected records from Processing Toolbox in QGIS 3?

qgis field-calculator qgis-3.0 qgis-modeler

modified Jul 31 at 12:53 Volta 569

2

votes

4

answers

87

views

Finding Invalid Geometry using QGIS?

qgis

answered Jul 17 at 16:56 Bruce Wiland 79

1

vote

1

answer

66

views

How is ST_Azimuth (in PostGIS) calculated?

postgis azimuth st true-north

modified 2 days ago Vince 13.7k

1

vote

6

answers

78

views

Seeking topics to be mentioned in beginners guide on QGIS? [closed]

qgis references

modified Aug 1 at 21:37 PolyGeo♦ 51.6k

2

votes

1

answer

78

views

Installing QGIS for Mac OS X?

qgis python installation

modified Aug 2 at 22:18 PolyGeo♦ 51.6k

3

votes

4

answers

77

views

QGIS Geometry $area Field calculator function

qgis area

answered Jul 23 at 8:42 Hutch 31

4

votes

1

answer

98

views

Selecting an amount of features that together sum up to a certain value?

qgis area select

modified 2 days ago Kadir 3,181

2

votes

1

answer

75

views

Field Calculator incremental letters

arcmap field-calculator

modified Aug 6 at 16:44 Midavalo♦ 25k

4

votes

2

answers

58

views

How to create a new QGIS color ramp from an r,g,b text file?

qgis import color-ramp

answered Aug 11 at 4:44 Kazuhito 11.8k

1

vote

1

answer

91

views

Setting multiple colors transparent in raster map in ArcMap (like in QGIS)?

arcgis-desktop raster transparency

modified Jul 25 at 9:27 PolyGeo♦ 51.6k

2

votes

4

answers

82

views

Merge shapes from the same layer by attributes

qgis mergeshapes

modified Jul 18 at 7:36 Jonas 319

4

votes

1

answer

82

views

Labeling Expression ArcMap

arcgis-desktop arcpy arcmap

modified yesterday BERA 10.3k

1

vote

1

answer

49

views

Buffering with rectangular end caps and not dissolving

qgis buffer

modified Jul 26 at 20:31 PolyGeo♦ 51.6k

1

vote

2

answers

38

views

Extracting column only from R spatial dataframe without $ notation

r

answered Jul 19 at 10:40 Stibu 131

1

vote

1

answer

78

views

How to query 1 feature of each category using QGIS (SQL like) expression language?

qgis qgis-3.0 expression

modified Jul 25 at 11:31 Mr. Che 1,435

1

vote

2

answers

77

views

Renaming several fields using arcpy.AlterField_management()?

arcpy fields

modified Aug 7 at 1:37 Son of a Beach 741

2

votes

2

answers

58

views

How do I run SAGA algorithms in PyCharm? [closed]

qgis python pyqgis saga pycharm

modified Aug 7 at 15:24 Suspectful 41

2

votes

1

answer

45

views

What is the complete list of values of ST_GeometryType() in PostGIS?

postgis

modified Aug 3 at 4:09 Mike T 29.8k

1

vote

2

answers

57

views

NumPy memory error on large rasters

arcpy arcmap numpy memoryerror

modified Aug 7 at 21:12 Mike T 29.8k

Looking for more? Browse the complete list of questions, or popular tags. Help us answer unanswered questions.

Geographic Information Systems Stack Exchange works best with JavaScript enabled