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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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2answers
4k 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 ...
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1answer
127 views

Seeking program to highlight and calculate multiple areas on satellite image? [closed]

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 ...
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0answers
52 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 ...
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2answers
2k 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. ...
1
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1answer
788 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 ...
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1answer
255 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 ...
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1answer
38 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
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1answer
85 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
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2answers
624 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 ...
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2answers
187 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 ...
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0answers
770 views

How to OCR topographic maps

I have old topographic maps that I have scanned and converted into PDF in Acrobat XI 11. I need this PDF to be text-searchable (not mere image). To do this I tried text recognition in Acrobat but it ...
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1answer
198 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 ...
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2answers
10k 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 ...
4
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3answers
3k 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 ...
3
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1answer
88 views

raster topo map with gaps to DEM

I'm trying to create a DEM from this raster map: I managed to clean all the shapes and text. I tried to write a program which finds the curve pieces and connects them. But, I realized that it is not ...
2
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2answers
678 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 ...
5
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2answers
1k 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 ...
1
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1answer
740 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
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2answers
370 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
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2answers
4k 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 ...
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0answers
84 views

Creating 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 ...
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6answers
805 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 ...
7
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0answers
852 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
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1answer
215 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
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1answer
1k 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 ...
6
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1answer
848 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 ...
4
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1answer
1k views

Digitizing contour lines from paper maps using QGIS?

Is it possible to give digitized altitude lines (from paper map) heights using QGIS?
5
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1answer
170 views

How to insert some holes in a polygon?

I have a problem with QGIS digitizing advanced tool plugin. I have a landcover-like shapefile. I have to perform some corrections on it, and I have to cut or split some polygons. I want to insert ...
1
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1answer
119 views

Digitizing custom road for ArcGIS Network Analyst?

I've built my network and now I am creating custom bus routes. However, one of my bus routes makes a stop on a private road that I had not realized was included in my network. How should I go about ...
3
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3answers
3k views

“Node tool: could not snap to a segment on the current layer” message

I have a strange issue. Editing a layer with node tool I get always the following message: "Node tool: could not snap to a segment on the current layer." This error happens to me even with a fresh ...
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2answers
3k views

Converting *.jpg scanned from line paper map to vector data in ArcGIS for Desktop?

I want to digitize automatically old paper map that scanned to jpg . I know that it's possible to digitize it with arc-map but I can not remember how to do it.
10
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1answer
4k views

How to split a line into a specific number of parts?

I've seen a lot of questions involving splitting a line with the help of a point layer. I want to split a line in fractions of its length. For example, I have a line 400 meters long, I want to split ...
4
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1answer
1k views

How to snap and move circles by the center?

I have a point layer, and a polygon layer with buffers of a given radius around each point. I need to move points, and check that each buffer is not above forbidden land/plots. In autocad, you can ...
3
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2answers
816 views

QGIS Freehand editing plug-in: blocked attribute table

I can't save object after drawing by Freehand editing plug-in. I suppose it will be connected with creating some (special) column in the table. Could anyone suggest a solution?
3
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1answer
875 views

Digitizing RGB TIFF automatically using ArcScan

Is it possible to digitize RGB TIFF by color? I need to select all the vegetation cover types from the image below, which is a part of an aerial photography of an island (http://george.wildlifeintel....
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0answers
135 views

How to set a defined distance between nodes to digitize in qgis?

Using QGIS (by now I have the 2.4 version) I would like to set some parameter (I don't know if such exists) that would impose a definite or maximal distance between nodes when digitizing a polyline or ...
3
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1answer
1k views

How to find the projection of an image?

Instead of georeferencing the image and deforming it, I'm trying to find the projection used by the author of the image. I've got tens of these distribution maps to digitize. The idea is to avoid ...
0
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0answers
140 views

QGIS Fill Ring tool problem

Using the new (in 2.2) 'Fill Ring' tool and it doesn't seem to work correctly in all cases. It seems that if I try and digitise the new ring close to the polygon boundary, TWO (or more) geometries ...
7
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1answer
7k 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 ...
2
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1answer
177 views

unable to draw polygon without attribute window popping up? [duplicate]

I'm fairly new to QGIS and an trying to draw a polygon via "Adding Feature". When I make the first left click to start, the attribute window pops up instead of letting me continue on with additional ...
1
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1answer
4k views

How to indicate flow of a watershed feature?

While tracing and digitizing rivers, streams, rivulets, etc., is it possible to indicate the direction/flow in the shapefile on QGIS? I'd like to avoid using map labels. Ideally, when done tracing, I ...
3
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2answers
2k views

Resuming (continuing) digitizing polygon feature from any vertex in ArcMap?

When I digitize in ArcMap with a Wacom tablet and a pen I often accidentally double click and finish my sketch. More often then not the accidentally finished sketch crosses itself. I would like to ...
2
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2answers
3k views

How to go with…somewhat complex geological maps in QGIS?

Just a follow-up to this question QGIS: Line to polygon conversion. Not sure do i have to continue there itself... We are currently digitizing a geological map...which has 36 features in total. Some ...
2
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1answer
494 views

Line to polygon conversion

Currently we are working in a geological project..in which all the Contacts, Linear & some other geological features have to be captured. The thing is most of the features have to be Captured as ...
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2answers
4k 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 ...
2
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0answers
350 views

How can I optimize ArcMap Editor's streaming mode for use with a tablet such as the Wacom Intuos?

I have the Wacom Intuos 4 Large tablet which I use occasionally outside of ArcGIS. I now need to digitize a large volume of polygons from aerial imagery and am finding the tablet's ArcGIS ...
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2answers
60 views

Which value should I assign my digitalized features?

I have a scanned an old document that contains geochemical interpolated values (no way to work with the digital file). This is the original image: And this is the digitalization I made from it: Now, ...
4
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3answers
1k views

“add feature” tool QGIS 2.0 - polygon fill blocks view of what I want to digitize

How can I change the settings on the vector "add feature" tool so the tool fill doesn't block my view of what I want to digitize? This problem popped up after I upgraded to QGIS 2.0 QGIS 2.0 Macbook ...
2
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1answer
404 views

Heads up digitizing - Polygons overlay differently with two different Satellite images

I have been digitizing building footprints from satellite image using ArcGIS 10.1 . Field data collections is done with the use of four corner point GPS way point. Due to multipath errors, we are ...
7
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2answers
18k 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 ...