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Questions tagged [digitizing]

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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57 votes
8 answers
81k views

Сreating polygons with straight lines and right angles in QGIS

When creating a polygon, how do I do it so that the lines are straight (90, 0 degrees, etc.) and when I create corners they can be right angles? For instance, how do I create a perfect square or ...
hpy's user avatar
  • 3,157
41 votes
3 answers
97k views

Enabling "Snapping" in QGIS while drawing polygons?

I tried to draw polygons in QGIS 1.7.0 and somehow I can't find or failed to find the "Snapping" option. I'm used to ArcGIS 10.0 where you have some snapping options, like placing points of polygons ...
q9f's user avatar
  • 2,176
20 votes
6 answers
608 views

The general public and their ability to use GIS applications - do we still need paper maps? [closed]

I am endeavouring to convince others in my organisation that GIS tools, in particular digitising tools, CAN be used by the general public, and we should promote their use instead of using paper maps. ...
Vidar's user avatar
  • 1,870
20 votes
1 answer
2k views

Digitizing in stream mode in QGIS using a tablet

How can I 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, ...
saxifr's user avatar
  • 201
17 votes
1 answer
321 views

Getting area / perimeter / length while digitizing

Is it possible in QGIS to see the area / perimeter of a shape or the length of a line while digitizing (not just after finishing it)? I know, I can use the Advanced Digitizing Panel to get the ...
MartinMap's user avatar
  • 8,326
16 votes
7 answers
9k views

Is it easy to digitize in ArcGIS using the Wacom tablet?

I do just enough digitizing (and touching up/ drawing when post-processing) to perhaps warrant the purchase of a Wacom tablet. Just wondering how well it plays with ArcGIS. What are your experiences? ...
Jakub Sisak GeoGraphics's user avatar
14 votes
4 answers
22k views

Digitizing raster automatically? [closed]

I have a raster (.sid extension) file. I want to digitize roads automatically in ArcMap, QGIS, etc. Digitizing by hand would be too time consuming. How can I do this ?
salihy's user avatar
  • 537
13 votes
3 answers
31k 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 ...
shawty's user avatar
  • 1,721
13 votes
4 answers
3k views

How to rectify polygon shapes in QGIS?

I have some polygon-shapes in qgis-1.7.0 and want to ensure that every polygon is a rectangle. See image below. Is there any way I can do this in QGIS (or any other f/oss)? Or how can I improve my ...
q9f's user avatar
  • 2,176
12 votes
4 answers
4k views

Is there a "Merge Parts" tool in QGIS?

In the advanced digitizing toolbar, QGIS has these 3 tools: Split Features, Split Parts, and Merge Features. Is there a tool or equivalent algorithm for the logical fourth one: "Merge Parts"? This ...
Nathan's user avatar
  • 1,304
9 votes
2 answers
22k views

Showing polyline direction in ArcGIS for Desktop (ArcMap)?

How can I show the direction of a polyline as it was digitised? I need this to check if my network analysis is obeying one way streets. I know of a tool in Xtools that can do this but my trial ...
Lucie's user avatar
  • 201
9 votes
5 answers
346 views

Digitising animal positions in aerial photos

Digitizing objects from orthophotos can be done using QGIS. It is just a matter of establishing a points vector layer with the right attributes and working through the QGIS user interface. Counting ...
ragnvald's user avatar
  • 3,191
9 votes
3 answers
18k views

Split polygon with selected line from another layer in QGIS

I am trying to split a selected polygon ("regions") with a selected line from another layer ("streets") in QGIS 3.8.3. In the example below, I want to split the selected polygon coloured in yellow ...
Pescariz's user avatar
  • 882
9 votes
3 answers
850 views

How to outsource scanning and georeferencing maps?

We have some historical paper maps and we want to get them scanned and geo-referenced and ultimately make a seamless map for a particular time. What vendors supply this service? (I have found ...
Deep's user avatar
  • 779
9 votes
2 answers
2k views

Automatic numbering of points during digitization in QGIS?

Does somebody know how to automatically number the points during digitization in Qgis. To explain, when I create the new point there is the window where I must to type the point number. Is there any ...
Slobodan's user avatar
  • 339
9 votes
1 answer
5k views

How to capture a rectangle within the Quantum GIS software?

I want to use "capture polygon" function in QGIS software to draw the indoor office cubical which is a rectangle shape. But the "capture polygon" function is not able to draw a perfect rectangle shape....
Xianlin's user avatar
  • 487
9 votes
1 answer
3k views

Is there a way to automatically snap loose points of lines to close by vertices with Quantum GIS?

I have a vector layer of lines that were drawn with the snapping option off. I need to have them snapped but, there are hundreds of lines. Is there any solution to do this automatically or semi-...
vascobnunes's user avatar
  • 5,568
9 votes
3 answers
3k views

How can I digitize features on an Y,Z plane in ArcGIS?

How can I geo-reference and digitize features on a Y,Z plane of a vertical cross-section in ArcGIS? The surface coordinate system is NAD 83 UTM 15. This is a simplified version of the question found ...
Jakub Sisak GeoGraphics's user avatar
8 votes
6 answers
5k views

Digitizing Free Satellite Imagery in QGIS without getting Alignment issues with Openlayers Plugin

I am trying to digitize OpenLayers data (such as Google satellite imagery) with no success. Whenever I try to move or zoom the canvas the vector layer I digitized loses the position relative to the ...
yair suari's user avatar
8 votes
4 answers
12k views

How to Continue a Line Feature in QGIS?

I'm looking for a way to continue a line feature in QGIS. I have checked the Digitizing Tools plugin (both regular and advanced) for a Prolong Line tool, but I haven't had luck. In ArcGIS there's a ...
RachelW's user avatar
  • 153
8 votes
1 answer
9k views

Is there a QGIS bezier curve tool?

I'm a recent convert to QGIS but have been confused about the lack of support for drawing curved shapefiles, especially when Arc has almost too many. A lot of the work that our consultancy do is based ...
aheigins's user avatar
  • 213
8 votes
1 answer
2k views

Snapping polygon layer to another layer automatically

I have two polygon layers in QGIS 3.4: 'Layer A' and 'Layer B'. These two layers have been digitized separately. Some features in these two layers are crossing or not meeting each other in some areas ...
Shiva's user avatar
  • 101
8 votes
1 answer
3k views

Create rectangle by entering width & height numerically in QGIS?

I need a quick way to create rectangles with set with & height in meters. Is there a straightforward way to do this? I am well aware that there are a number of ways to achieve this, but all that I ...
Aron's user avatar
  • 163
8 votes
1 answer
639 views

Use line style to adjust rubberband in QGIS?

I am digitizing lines and have to keep certain distances to other lines while digitizing. Normally I would just use a buffer to generate these prohibited areas and snap to these polygons while ...
Thomas B's user avatar
  • 8,846
7 votes
1 answer
584 views

Drawing points around polygon in QGIS?

I'm drawing many blocks like these Then I need to surround them by points at fixed distances from each other like so But I have a lot of blocks, and many points to calculate the distance, and then ...
AsdAsd's user avatar
  • 489
7 votes
1 answer
496 views

Looking for QGIS equivalent of ArcGIS streaming digitizing

I am trying to digitize in QGIS 3.14, and I have not been able to find an equivalent to the ArcGIS streaming tool. I was taught to digitize where (you trace the feature with your mouse and nodes are ...
Alexander Audet's user avatar
7 votes
1 answer
1k views

GRASS - Will r.to.vect work on this scanned map?

Total GRASS noob here. I have several very large hand contoured maps to digitize, and this thread intrigues me. In the past I have spent hours upon hours digitizing these maps and revisions in ArcMap. ...
Chad Cooper's user avatar
  • 12.7k
7 votes
1 answer
168 views

What is the correct geometric predicate in filter for aggregate function?

I have a layer with parcels ('flurstuecke') and a layer with subdivisions ('flure'). I want to digitize parcels and autogenerate the correct number of the subdivision with an attribute formular. It ...
Enzo Baldini's user avatar
  • 2,337
7 votes
1 answer
2k views

What is the fastest way to digitize features on a map?

I'm currently using QGIS basically to trace a bunch of polygons to show individual ponds from google maps. Some of the geometries can be pretty oddly shaped and using the nodal digitizing tool gets ...
ConservServe's user avatar
7 votes
2 answers
9k views

Extracting road and building features from raster data using ArcGIS Desktop?

I work with raster data and my task is to digitize a big image. This consumes much time just for digitizing roads and buildings! I'm looking for tools to simplify working on raster data to digitize ...
GIS Man's user avatar
  • 1,123
7 votes
2 answers
11k views

Using Advanced Digitizing tool in QGIS?

I would like to use the Advanced Digitizing tool and the Move tool to move entire polygons by specified distances and angles. For some reason the "d" (distance), and "a" (angle) fields are grayed out....
eyerah's user avatar
  • 197
6 votes
7 answers
11k views

How can I digitize a PDF image?

I have an image file in pdf format which includes some drawings (lines, closed areas, and points). I want to digitize it into a shapefile so that I can show it on a Google map. I have a couple of ...
user1899's user avatar
  • 1,427
6 votes
2 answers
6k 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 ...
cbunn's user avatar
  • 1,417
6 votes
1 answer
1k views

Quickly temporarily disabling snapping in QGIS 3?

In some other applications I use you can use one of the "shift" keys to disable snapping for a single operation. Is there an equivalent for the new node tool?
Russell Fulton's user avatar
6 votes
2 answers
12k 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 ...
bedfordtom's user avatar
6 votes
1 answer
305 views

Adding nodes automatically without clicking the mouse

Is there a way in QGIS (or maybe in another GIS (ArcMap, for example))) to automatically create nodes at a given interval when digitizing a raster? For example, I decided to create a Polyline object. ...
user13892757's user avatar
6 votes
2 answers
7k views

Creating/drawing "freehand" polygon features in QGIS?

I installed the Freehand Editing plugin but it doesn't seem to work with the latest version of QGIS; the icon appears on the Ditizing Toolbar but the icon is disabled. Is there any way to use a ...
Jakub Sisak GeoGraphics's user avatar
6 votes
2 answers
10k views

snapping polygons and lines [duplicate]

I recently downloaded QGIS on a Mac OSX 10.7.4 (lion) and purchased a master map shape file, of a particular area. I am trying to divide it into polygons following features on the master map vector ...
Rupert's user avatar
  • 71
6 votes
0 answers
3k views

CadTools plugin functionality in QGIS 3 beyond Advanced Digitising Panel?

I've recently migrated to QGIS 3.6.0, and I've realised that the wonderful CadTools plugin is not compatible with QGIS 3. I tried to use the Advanced Digitising Panel, but it's cumbersome and not ...
Pierre Alexandre's user avatar
5 votes
3 answers
6k views

Implementing Add Feature action using 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 ...
Greg's user avatar
  • 531
5 votes
4 answers
7k views

Looking for an efficient way of digitizing building footprints using orthophotos and ArcGIS 10

In the past I've used PCI Geomatica to do something similar using the softwares classification functionality. Are there some tools/tricks in ArcGIS that will partially automate the process. I remember ...
dchaboya's user avatar
  • 984
5 votes
4 answers
603 views

QGIS 3x - categorized style customization based on a part of the string

I have a problem. I am digitizing the map and I want to distinguish one group of polygons from the other group. The basic difference between them lies in their ID (string). One of them has the ID ...
Geographos's user avatar
  • 4,109
5 votes
1 answer
1k views

Fill attribute-table on feature-creation based on intersection with other layer

I am digitising line-features based on WGS-84 point-coordinates from a PDF which cannot be copied from. The final line layer should contain lines which each connect two points and have the following ...
Erik's user avatar
  • 16.4k
5 votes
2 answers
385 views

Is it possible to have presets for digitizing in QGIS?

I want to digitize many identical features (same attributes). They will have different location. Type: points and lines. Is it possible to have presets? Like to select: "traffic calming" and then all ...
Paul Nicoara's user avatar
5 votes
2 answers
618 views

Heads up digitizing of rooms and doors using ArcMap

I am digitizing the floorplans of various schools in our county. This is for the Fire Department so they want to be able to see where doors are within the building. The doors do not necessarily have ...
Kyle Shepard's user avatar
5 votes
4 answers
1k views

Editing with auxiliary features (lines, points etc.) in ArcGIS Desktop?

In order to digitize exact features in ArcGIS Desktop 9.3.1, our draftsman would like to use auxiliary features (lines and points mostly) that don't have to be saved later on. I told them the easiest ...
jonatr's user avatar
  • 3,185
5 votes
2 answers
804 views

Automating line adjustment to a point or a series of points in ArcGIS Suite?

There are multiple toolboxes in ArcGIS Suite that deal with geographic transformation and correction, such as Spatial Adjustment, Rubbersheeting, and Snap. I'm not sure how to best use a tool to ...
JMNC's user avatar
  • 197
5 votes
2 answers
3k views

Snapping multiple nodes of a polygon to the nodes of a line?

I am working with vector polygons that have derived from hand drawn areas from when mapping was carried out with tracing paper over paper maps. Therefore many of the polygons don't exactly line up to ...
Martin Hügi's user avatar
  • 3,612
5 votes
1 answer
6k views

OpenLayers 3: Change drawing style, but keep style of previously drawn features

I created a vector and a drawing interaction: // Create feature collection and vector var featureCollection = new ol.Collection(); var vectorSource = new ol.source.Vector({ features: ...
BritishSteel's user avatar
  • 6,647
5 votes
3 answers
2k 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 ...
Lisdengard's user avatar

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