The process of converting features on a map or image (either hardcopy or digital) to vector-based data in digital format.

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2
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0answers
37 views

Digitized points are getting displaced automatically in QGIS

We are capturing 100's of drilling sample locations in QGIS. At times, we are copying the whole set of points from adjacent survey_lines to the next one. After that, we will capture the respective ...
2
votes
1answer
21 views

Automatic selection of colored regions when digitzing choropleth maps

I am new to working with GIS. I have a raster choropleth map similar to the one displayed below. I want to create a shapefile from the map, where each layer contains all the countries that have the ...
1
vote
0answers
41 views

Newly added points disappearing after saving edits in QGIS.

I am adding features to a shapefile point layer in QGIS 2.12 Lyon. When I add the new point I can see it, but once I click the Save Edits button it disappears. When I click Toggle Editing button to ...
3
votes
1answer
30 views

Change direction of polylines from DEM data

I am trying to define the direction of my polylines (which represent gutters in a drainage system). Does anyone know if it is possible to define the direction based on elevation data extracted from a ...
0
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0answers
41 views

Digitizing scale when digitizing from Bing imagery service in QGIS

I need to digitize a bunch of islands from imagery in QGIS. It is the Bing Maps aerial imagery layer. I will obtain all required permissions. My plan is to lock the map scale at 1:25,000 and use heads ...
-1
votes
1answer
57 views

How are digital maps generated? [closed]

This is a more of a noob GIS question. How are all the features on the maps we come use know and love (Google Maps, Bing Maps) generated from imagery? Does somebody actually look at the imagery and ...
1
vote
1answer
66 views

Connecting vertices to form a line without using an attribute

I have a number of multipoint features that form lines (hiking trails). I would like to connect the dots of each multipoint feature to generate line features, but there are no attributes with which to ...
0
votes
0answers
39 views

Is it possible to trace basemap features?

I'm looking for an easier way to digitize. Does anyone know if it's possible to trace basemap features (OSM/stamen/etc) in QGIS (2.12)? For example, as opposed to creating various vertexes along a ...
1
vote
1answer
60 views

Digitized Map To Scale

Is it perfectly acceptable to produce a map at a scale of 1:24,000 from a database that was digitized from a 1:100,000 scale source map?
2
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0answers
82 views

“Error” on Advanced Digitizing Window in QGIS

I have the word "Error" that has appeared on my Advanced Digitizing Panel since upgrading to QGIS 2.12.0 Lyon. It doesn't appear to actually affect anything negatively... has anyone else seen this or ...
2
votes
0answers
72 views

How to avoid topology errors when digitizing a road network?

I am working on a road layer project. For the snapping option I'm using the mode to vertex and segment and tolerance 5 pixels. When zooming in (to the max) I do not notice a gap. But when I use the ...
0
votes
0answers
24 views

Digitised problems - Combine isolines

I try to digitize a large number of topographic maps. Digitizes the contour every four meters. I use the program ArcGIS 10.3 and ArcSCAN. The problem is that it has many objects in the map outside of ...
0
votes
1answer
37 views

Niche MapInfo Question : Digitising options

I've recently started using mapinfo to digitise on a daily basis, I am usually georefencing old deeds (on top of OS Mastermap) and then digitising them. The problem is when drawing the polygon the ...
1
vote
2answers
77 views

Edit Geometry with digitizing tools in QGIS of a postgis layer

I have a multiline PostGIS layer added to my QGIS 2.10.1 Pisa. I'm able to add features using the digitizing tools, but I'm not able to use the delete or node tool. It remains gray even if I'm in ...
1
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0answers
24 views

Rotate functions in “Rectangles, Ovals Digitizing” as well as “Advanced Digitizing” distort shape dimensions

I am trying to rotate squares via the rotate tool in the "Rectangles Ovals Digitizing" Plugin in QGIS. The dimensions/proportions of the sides, however, are distorted whenever I do so. Any idea of why ...
1
vote
2answers
41 views

USGS National Map Ortho - Digitizing

As a part of project scope we have to deliver to the Client digitized data sets – some houses and roads. Can we use USGS Orthoimagery from The National Map layer for feature digitizing? ...
2
votes
0answers
37 views

Geometry issues when digitising in QGIS

I'm digitising a large number of maps from hand drawn mud maps and digital images, and although I have used the snapping tools ("snap to vertex and segment", Tolerance 10 pixels, avoid intersections) ...
1
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0answers
24 views

Fill of sketch polygon blocks view of what I'm trying to digitize

I am trying to digitize polygons using QGIS 2.10.1-Pisa, but the red fill of the sketch polygon blocks me from seeing the imagery that I need in order to draw said polygon. I have tried going into ...
1
vote
1answer
51 views

Freehand editing without holding down mouse button in QGIS?

I am trying to delineate wetlands using satellite imagery in QGIS 2.10.1-Pisa. I'm using the Freehand Editing plugin. Is there a way to draw polygons without having to hold down the mouse button, ...
0
votes
1answer
53 views

Mapbox Satellite - Digitizing

As a part of project scope we have to deliver to the Client digitized data sets – some houses and roads. Can we use Mapbox Satellite global imagery layer [1] under Professional plan [2] for feature ...
1
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0answers
56 views

Error in Editing Point Shapefile: I can't add a new point feature

I want to add a point to a point shapefile. I place the cursor in an empty field. The strange thing is that the point of the point shapefile that is nearest to the cursor is highlighted. If I click ...
0
votes
0answers
36 views

Capturing line version 2.10

I'm a beginner (as in complete noob) user with version 2.10. I'm trying to digitise some rivers from a raster layer but can't find the "Capture Line" tool which the tutorials and resources show as ...
2
votes
2answers
126 views

Suitable Raster processing methods to extract field boundaries from images

I'm trying to extract field boundaries and features from a lot of aerial images of agricultural land - and avoid digitizing these features manually. I've managed to get a crude raster file of the ...
2
votes
0answers
29 views

QGIS 2.8.1 (Windows 64bit). Setting snapping to the “decoration” grid?

I was wondering if anyone knew of a way to snap digitizing to the grid you can create in View>Decorations>Grid? I can't see anything in the manual or the menus so I am thinking there probably isn't ...
2
votes
2answers
233 views

Create circle shapefile vector in QGIS

Is it possible to create a circle shapefile feature in QGIS, like it is possible to do in ArcMap? I am trying to digitise a map wich features roundabouts, which I'd like to be part of the same ...
2
votes
1answer
81 views

What program can I use to highlight and calculate multiple areas on a satellite image?

I would like to calculate the area of all the parking spaces in my city (North Miami Beach). I would highlight the parking in two layers, commercial and residential, and then export it to Excel and ...
1
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0answers
34 views

Digitising - Separate fill and line opacities (or remove fill)

I have a client who specialises in aerial photograph interpretation and is in the process of moving from AutoCAD to QGIS. They find the auto 'fill' when digitising polygons really disruptive and ...
1
vote
2answers
96 views

How to close a polyline in QGIS while digitizing?

We need to work on a line layer where some features are closed and some are open. The closed features need to be closed perfectly, so that the first and the last point of the polyline perfectly match. ...
0
votes
0answers
148 views

QGIS 2.8.1-Wien snap options does not show “avoid int” dialog box

I am trying to digitize a set of adjacent polygons in QGIS 2.8.1-Wien, runing under Widows 8. When I go to Settings > Snap options my vetor (polygon) layer does not show the "avoid int" box. Can ...
0
votes
1answer
112 views

How to suppress advanced digitizing tool window

I'm using QGis for years but suddenly I stuck with something that I'm sure it's an easy fix. Every time I start to create a new feature, the Advanced Digitizing tool window pops up. Do you know how to ...
1
vote
1answer
122 views

Advanced Digitizing Tools Crashing in QGIS 2.8.1 x64 on Ubuntu 14.04

I'm hoping someone here can tell me what I'm doing wrong... Whenever I use the Advanced Digitizing tools in QGIS, I crash after about 5 clicks. I'm even doing it without OTF transformations on. Any ...
1
vote
1answer
24 views

Digitizing 2-node lines?

I tried digitizing in to a new sqlite line layer with autoincrement id ticked..... I want to create a 2-node line, but there seems to be a minimum limit of 3 nodes. Is this correct or am I doing ...
0
votes
2answers
55 views

Touched lines but not connected in ArcGIS 10.x

Ι convert a contour file DWG to SHP file. The lines are touched but disconnected and they are broken in many places. Is there an automated way with a particular tolerance to automatically connect the ...
2
votes
2answers
136 views

Conditional Value Map widget in QGIS

I am looking for a way to implement conditional value mapping in QGIS. This means that the values available in attribute number 2 depend on the value provided in attribute 1. Example: If the user ...
1
vote
2answers
81 views

QGIS: digitized object disappear when filling in attributes

When digitizing, for example a point, the attribute window opens for you to fill in the pre-defined columns/information. But no point is shown in the map while you do this in QGIS 2.6. It was shown in ...
1
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0answers
149 views

How to OCR topographic maps

I have old topographic maps that i have scanned and converted into pdf in Actobat XI 11. I need this pdf to be text-searchable (not mere image). To do this i tried text recognition in acrobat but it ...
0
votes
1answer
53 views

Same Image and Shapefile are not overlapping in ArcGIS for Desktop?

An image is Digitized in ArcView 3.3 with JPEG extension; But not with Image analysis extension. When I open that image and shapefile in ArcGIS 10.1 for Desktop then they are not overlaping each ...
4
votes
2answers
509 views

How to digitize building footprints with orthogonal edges?

Using QGIS, I am trying to digitize an old raster map, and because I ultimately want to load these 2d layers into sketch-up to turn into 3D models, I need everything to be square. Here's a sample of ...
2
votes
1answer
227 views

How to implement Add feature action from PyQGIS

I'm trying to implement / reuse Add Feature functionality in my python plugin. there a class/function that handles geometry creation on canvas based on layer geometry definition? I'm checking API but ...
0
votes
0answers
91 views

Easy way to digitize DSM for feature extraction

I have a Digital Surface Model (DSM) that I would like to digitized to extract features (buildings, etc.) using ArcMap 10.1. I would like to know if there is an easy way to digitize the DSM or to ...
2
votes
2answers
260 views

How to automatically convert dots on paper maps to vector points?

I have several paper maps with dots that I need to convert to vector points. I was hoping to get some suggestions on how to accomplish this without recreating each and every point by hand. I know ...
3
votes
2answers
367 views

How to digitize rectangles with snapping in QGIS?

Trying to digitize a floor plan for a building (just need polygons for each room) in QGIS (shapefile layer). I started just trying to draw the features, but want to align polygons so that there is no ...
0
votes
1answer
120 views

How to change the QGIS edit cursor and node icons?

Two things I really dislike at QGIS, are the "fat" node icons (when editing lines) and the cursor which cover the object below and make it impossible to accurately move a node. Is it possible to ...
2
votes
2answers
177 views

ArcGIS lines to polygons without holes

I have a dataset with contours. Depression contours are separate of the normal contours and need to be digitized counter-clockwise. Still, there are usually some faulty ones with wrong direction and ...
4
votes
2answers
472 views

Adding Eastings and Northings as attributes automatically to a point layer in QGIS

I have a point layer that I am adding to and am working in British National Grid. Two of the columns are Easting and Northing. When I add a new point I want these two columns to be filled out ...
1
vote
0answers
29 views

Best way to create sub-polygons based on underlying basemap

I'm looking at ranging patterns where animals go in and out of nature reserves into residential areas. In addition to home range polygons, I've generated polygons made from applying 25m and 50m ...
1
vote
6answers
232 views

In what real-world examples do users still digitize features from a map?

Is digitizing of map features completely dead? For example, when and why do you still digitize features from a map? It can be heads digitizing up from a scanned paper map (or image, or whatever) or ...
3
votes
1answer
175 views

How to digitize in stream mode in QGIS, using a tablet?

How to digitize in stream mode in Qgis, using a wacom cintiq tablet? freehand it's no use. i need something like MNDR stream digitizing extension for arcview 3.x, which allows continuous tracing, ...
2
votes
1answer
194 views

Digitizing takes a long time [closed]

While in the process of digitizing for instance a large body of water or piece of land it takes a long time to process. Is this normal? If not what can I do to speed up the process.
2
votes
1answer
345 views

Why are my polygons automatically simplified/generalised when merging them in ArcMap 10.2?

I am creating a small land use map, as an exercise for visual image interpretation. I created a shapefile and started digitising polyogons with the polygon tool. The problem is that some of my ...