Questions tagged [offset]

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Why does ST_OffsetCurve returns MultiLineString in some case?

In the Postgis docs of ST_OffsetCurve, there is this sentence: Note that output may be a MULTILINESTRING or EMPTY for some jigsaw-shaped input geometries. It's not clear to me in which case this ...
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1answer
41 views

How to calculate the azimuth of an offset point/line?

After receiving and answer to this question, I am stuck with another problem. For context, my end goal is to assess windward/lee side of a forested edges (line segments) in respect to a dominant wind ...
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35 views

Offsetting multiple points

I have a multiline shapefile and a point shapefile. The points are supposed to fall in the center of line breaks but when imported to qgis, the points fall on one end of a line break. Is there a ...
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20 views

Creating Road Edge of Pavements from Road Centerlines using QGIS

I have a Road Centerline data set and would like to use it to create a Road Edge Of Pavements data set that I could then export to a CAD format. Is there an easy way to do this in QGIS?
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16 views

Confused on gainbias.txt values using OpticalCalibration Orfeo-Toolbox

I'm currently working on a preexisting project that utilizes Orfeo Toolbox OpticalCalibration. There are different satellites that each have different data regarding solar irradiance that the project ...
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1answer
110 views

Displaying overlapping lines as separate offset lines in QGIS3

I'm drawing lines in a map that represent cables in underground pipes. Sometimes there are multiple cables going through the same pipe, so I'd like to draw each cable as a different line, but want it ...
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1answer
32 views

Setting proper rendering order because offset causes odd corners for lines

I used offset on these lines that are on top of each other. How can I make it so the red line is not interrupted by the orange? I can put the orange under the red, but there is another corner where ...
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35 views

Fixing fixed layer offset

I have a shapefile layer whose CRS is WGS84. However, all points are off by some fraction of degree, roughly corresponding to a dozen of meters. Is there a way in QGIS to fix this offset? I can more ...
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1answer
51 views

Applying offset to lines that are on top of each other, result like metro map [duplicate]

As you can see from my picture there are a lot of places where the same lines run on top of each other. Imagine a tram map. How can I make sure that the ones that are behind are visible too? Just ...
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1answer
159 views

Different lines that run on top of each other show as different lines

Imagine I have some bus lines each with a different colour, and sometimes the different bus lines run on the same road, but I don't want one of them to disappear. Is it possible to make them show as ...
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33 views

Huge offset in Lambert Conformal Conic data using ArcMap

I want to display my lat/lon climate data, which is in Lambert Conformal Conic. But when I load it in ArcMap (also in QGIS) it will always be displayed with a huge offset. The data is located in ...
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91 views

QGIS, labels offset for a line layer

I am working with rule based labels on a line layer and need to move the labels along different axes along the line. I want to move the label 2 along the line a few millimeters. For the label 2, the ...
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38 views

Creating an intersection (mix of offset and buffer) of 5m on each polygon feature in QGIS [duplicate]

I'm trying to reproduce the steps needed to aim this goal: Given a layer of polygons, I'm want to retrieve for each polygon which is at a distance less than 50m to a 2nd polygonal layer the only 5m ...
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36 views

Specific mixed feature between offset, buffer and intersection

I'm trying to reproduce the steps needed to aim this goal: Given a layer of polygons, I'm want to retrieve for each polygon which is at a distance less than 50m to a 2nd polygonal layer the only 5m ...
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18 views

Need to arrange the point features in a row or inverted triangle

Need to arrange the overlapping point features in a row or inverted triangle which are in same layer with 0.1 offset. enter image description here ps://i.stack.imgur.com/B8idh.png
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1answer
27 views

Offset points to show multiple points in one location, while simultaneously showing two categories of points

Problem: I'm using ArcMap 10.7.1. I have a dataset that has two categories (A and B) of points and has multiple points in one location. I want to "jitter" or offset these points from each other, so ...
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1answer
48 views

Overcoming zoom level problems for layer offsets in QGIS

In this question I was able to align some labels with polylines representing hectometer points along a railroad. I did this using custom expressions in the "data defined" portion of the labelling tab ...
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529 views

Parallel Offset of a Polygon Edge with Shapely

I need to offset edges of a polygon by different amounts. buffer() will parallel-offset all the edges by the same amount, and each in its edge-normal direction (and in both directions if applied to a ...
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1answer
222 views

Rescaling and reoffsetting a point cloud with lidR?

I'm trying to analyse a a 3 x 3 metres scan derived from terrestrial photogrammetry (i.e. local coordinates, with 0,0 in the centre of the point cloud) to obtain a DSM. Importing the file in lidR, I ...
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23 views

My map digitization is offset to the original georeferenced raster

So I after I was done digitizing on a georeferenced raster map saved my work and then got back to it after while, found out it's offset to the original raster. Note that I tried to rotate my work ...
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2answers
380 views

Offset Line with Python in QGIS

I wanted to know how could I do a offset line of one layer in a new layer. I take my layers, even if I only have one active (streets) canvas = iface.mapCanvas() layers = canvas.layers() In my case, ...
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2answers
68 views

QGIS legend in layout manager

I have offset some data points in QGIS but I want my points to stay aligned in the legend? It looks funny when points aren't lined up. Anyway I can do this?
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67 views

Offset Expressions Dynamic QGIS - Unique non-repeating Numbers

I am trying to create a layer style that shows line features that share the same geometry, an exploded view for line Features. What I have done so far via the Offset expressions in QGIS 3.6 ("...
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55 views

Large offset between two identical vector layers

I want to have a dxf layer to overlay another layer. The dxf layer is already saved to a shapefile with the needed crs. The layer has a large offset and nothing happens when I set the crs to the ...
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1answer
427 views

Connecting offset point symbol to its original position in QGIS?

I'm drawing a track where I want to place icons (point symbols), but with an offset so that the line is fully visible. Here is an example: The origin is exactly on the track, therefore when zooming ...
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2answers
701 views

Line Offset Tool in QGIS 3 not working between different layers

In QGIS2 it was possible to use the lineoffset tool between two different layers. You could for examle use a polygon from a different layer to generate an offset line in your linelayer. In QGIS3 this ...
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33 views

What is the sIgnificance of equator in GPS offset calculation?

I am going through a SAE document where it says that the GPS offsets (NodeLL) should be calculated in such a way that the range should be within one of these: ranges of +- 0.0008191 degrees ranges of ...
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2answers
228 views

Producing offset after georeferencing Soviet topographical military maps from printed control point coordinates in QGIS

I have 'acquired' a collection of scans of (previously top-secret) Soviet-era military topographical maps at a set of 1:25.000. I want to georeference a set of these scans. I know the coordinate ...
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0answers
389 views

QGIS draw line segments with “geometry generator” based on segments angle

I have quite a hard problem to solve here and I don't know if its even possible with the geometry functions in QGIS. I have a line geometry with equidistant vertices, that is, same length segments. ...
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1answer
74 views

Does QGIS Cloud support offsets for symbology?

I used the offset settings for symbols in QGIS 2.18 but when uploaded to Cloud, the offsets don't seem to exist. Can this setting be used in QGIS Cloud or is there an alternative?
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1answer
148 views

Offsetting 100 ft from line feature while editing in ArcMap?

I have the ArcGIS 10.6 advanced lisense. I am trying to offset a line feature using the editor tool. I know that I can do it in COGO, but how to set the unit as ft. In COGO, the offset unit option is ...
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82 views

PostGIS generate lanes for multilinestring map (ST_OffsetCurve)

I currently have a road network for specific area as multilinestrings. It only shows the road as a single line. I would like to generate lanes for that as well, using some kind of offset. The problem ...
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27 views

Offset line, when zooming out line extends at intersections

[1[]2I'm doing offset in ArcGIS in a cartographic line symbol. Before the offset the line in all scales appears OK. But when zooming out, the offset line extends out at intersections. While when ...
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1answer
95 views

Map Offset, Design not in Line with Map when I load my workspace

We are facing an issue when using QGIS to plan and design FTTx networks. We create the design and it all looks great and print it via composer to be validated on site but when we go back into the ...
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119 views

How to offset points from a coastline

I need to create a set of points with a fixed spacing and given distance from a a georeferenced coastline. My idea is trying to obtain a parallel line and then placing points on it. To do the first ...
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816 views

Offsetting polygons by meters with clipper

I would like to create buffered polygons of locations (towns, villages etc) in order to use them for searching in radius. This is what I would like to achieve (units for ilustration): This is how I ...
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2answers
1k views

Adding offset to overlapping lines in qgis in same layer?

I have ONE layer of linestrings and some of them are overlapping, I need to display the overlapping lines with an offset. I have seen the solution using the offset in style for the whole layer but it ...
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1answer
318 views

Is there a way to use windowing functions (lag, lead) within the QGIS Field Calculator?

I am keen to compute a windowing function on values in QGIS. I was not able to find a lag/lead function. I think this could be emulated using @rownumber and $currentfeature, but I am not expert in ...
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1answer
2k views

ArcPy Solution for Copy Parallel

This question has been marked as a duplicate multiple times now. Please read the entire question before flagging it as a duplicate. The previous "duplicates" for questions about copy parallel do not ...
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140 views

GDAL gdalwarp usage on QGis - how to set cell position of the clipped raster to be equal to the origin of the source cell

I work on a Windows QGis 2.14 platform. I need to clip a raster with a vectorial polygon. When I use gdalwarp I cannot find where is the setting for establishing the output graticule position respect ...
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1answer
2k views

Lat/Lon point transformation/offset on arbitrary segment

I'm looking for something very similar to those stack exchange GIS questions: Algorithm for offsetting a latitude/longitude by some amount of meters, How to convert (geodetic pose + cartesian offset) ...
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1answer
3k views

Create offset polygon

I am looking for a method that enables to create offset polygons with a defined distance in ArcGIS. Like in Sketch Up, it allows to create the exact same shaped polygon as its input (selected) polygon....
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1answer
717 views

add scalefactor and offset to NetCDF

I am converting some NetCDF files from Float32 to either 16bit or 8bit to safe space on a server. Since I Originally created these NetCDF using GeoTIFF´s this is where I apply the conversion before ...
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2answers
491 views

Preventing Symbols offset in map from being offset in legend of QGIS?

I've been searching for a solution to this, but cannot seem to find an answer. I have a map where some stacked markers have been offset to be visible on the map. This makes their symbol offset in the ...
3
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1answer
771 views

Multiple and Sequential Parallel from line

I have a vector line and I want to create multiple sequential parallel lines of this line. How can I do that ? For example, in AutoCAD you can do many offsets by a determined distance, and I want ...
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1answer
968 views

Data Defined Override XY offset input

I have several rectangular polygons that overlap each other and I'd like to label them with the ID's (for atlas page numbers). The image below shows my initial setup. I've offset each label from the ...
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0answers
266 views

Alternative to Event layer plugin for QGIS > 2.8?

It appears to me and from another post that the qgis "Event layer" plugin is not fully functional in versions above 2.8. Trials using versions 2.14 & 2.18 failed to generate a Point memory layer. ...
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3answers
3k views

How do I zoom/Pan to a Leaflet Map, such that the given point is off-center?

In my Leaflet Application, on some event, I want to zoom to a particular marker, and then show it's popup. I have certain other custom components on top of the map, and the Popup that appears, is ...
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1answer
628 views

Using a formula to set the offset of a line pattern on QGIS 2.18

I’ve been trying to fill city boundaries polygons with a 3 colors stripes pattern (red, orange, green), whose respective thickness is proportional to 3 variables, different for each city, but whose ...
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1answer
703 views

Generating line offset, perpendicular using PostGIS?

I'm trying to generate two line offsets from a line but I'm having problems generating them as they should be. Using PostGIS select st_asgeojson(st_union(the_geom)) from ( select ST_Line_Substring(...