Questions tagged [alignment]

The property of two different things being coincident or making them so.

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14
votes
9answers
14k views

Aligning two non-coincident equi-resolution raster grids in ArcGIS Desktop?

I have two rasters: a digital elevation model (DEM) and a Landsat band. The grid resolution of both is 30 m, but the grids are not coincident (see image: the dark raster on top is the DEM; the light ...
8
votes
2answers
5k views

Move a layer in QGIS to a precise position based on centroid

I'm not quite sure how to phrase this so apologies if it is a duplicate. I have a project that uses a series of lines created from the boundaries of polygons overlaid onto a map in QGIS. I understand ...
7
votes
2answers
183 views

Aligning line with closest line segment in PostGIS

I've got a road network dataset and a dataset that consist of multiple disconnected lines of varying lengths in PostGIS. Most of these lines are (largely) parallel to the road network, but the ...
6
votes
1answer
1k views

Determining the direction of polygons?

Is there a way in QGIS to figure out the direction of a polygon, if there are no values given? What I need to know is if a polygon is directed to the south. I want to know the direction of a house ...
6
votes
1answer
527 views

Extract By Mask moving pixels in ArcGIS Desktop?

I am creating some statistics based on certain values. The issue I am having is that the extracted values are not the same as the values in the original raster. This creates incorrect output, and I ...
5
votes
3answers
708 views

Layers in QGIS that Should Align Don't (but do in FME)

I have seen numerous questions of this nature and all suggest incorrect assignment of CRS along the way. I feel I have tried every combination of relevant CRS values but still cannot load two ...
5
votes
1answer
4k views

Aligning text/features on a map

Sorry for the simple question .... but something odd is happening in ArcMap & I don't know why. When I want to align text or features relative to each other, they are aligning relative to the ...
4
votes
2answers
4k views

How to draw polygons in QGIS perfectly aligned

I would like to draw polygons for an indoor map test and would like to draw perfect rectangles (horiz. and vertical edges). How to set QGIS options on polygon edit /draw to do that?
4
votes
2answers
666 views

How to align edges of overlapping polygons in the middle line?

The problem Here are two polygons that overlap. My ultimate goal is to reshape the grassland (green poly) and the reservoir (blue poly) so they share the edge somewhere in the middle of their ...
4
votes
2answers
2k views

How can you align two shapefile layers in QGIS

I am a very beginner with QGIS. I would like to know how to align two shapefiles in QGIS. The image below shows the mismatch:
4
votes
2answers
600 views

Align pixels from two rasters with different cell sizes

I have two rasters in a PostGIS database that I want to be able to compare. The first raster is at 5m pixel resolution and the second raster is at 30m pixel resolution and is on a different grid. How ...
4
votes
1answer
958 views

How to align QGIS legend items to the right?

Is there a way to align QGIS map composer legend items to the right, for right-to-left languages? There is only a title alignment option. Furthermore, I found this ticket from 4 years ago regarding ...
4
votes
1answer
537 views

Aligning raster data to vector data in QGIS?

I'm in the midst of aligning century-old maps (of Paris) to vector data of the modern same: Qgis' Georeferencer tool works fine, but doing the entire city that way is a gargantuan task. Paris hasn't ...
4
votes
1answer
153 views

QGIS shapefile misaligns when adding to arcGIS Online

I have access to an ArcGIS Online account. I wanted to create a map with some polygons. So I've used QGIS to make the shapes, saved the layers, zipped them, and uploaded them to ArcGIS Online. Two ...
4
votes
1answer
136 views

What is the standard terminology for raster alignment?

I would like to identify two types of raster alignment (assuming SRS is the same), but I am unsure of the correct terminology for these (or whether there is even a 'standard')? First, there is 'pixel ...
4
votes
0answers
565 views

QGIS “Align Edge” equivalent?

I'm trying to move from Arc to QGIS, and spend a lot of time making maps out of polygon features. One tool that I can't find is an equivalent to ArcGIS' topology tool "Align Edge" - is there such a ...
4
votes
0answers
82 views

Center my contour values in QGIS

In QGIS have an issue with my contour value labels being pushed to the edge of my map, instead of lining up at the center where they seem to have more space. Does anyone know why this happens for some ...
3
votes
2answers
2k views

How to align/georeference distorted vector layers in QGIS?

I've got a shapefile which has been digitized from a strongly distorted historical map, and would like to align it as nicely as possible to another precise shapefile layer. The transformation must ...
3
votes
2answers
4k views

OL3 the text is incorrectly aligned

Using OpenLayers3 I have observed an incorrect alignment of the text when styling the features of the Cluster source. Also the baseline of the text appears to be ignored. The below code sample (or ...
3
votes
1answer
451 views

Align the border of a polygon to overlap the border of another using QGis

I have two polygon layers. As seen in picture, the border of two layers do not fit. I want to align the border of layer 1 (blue) to overlap the border of layers 2 (pink). How to do it with QGIS?
3
votes
1answer
316 views

GRASS - Aligning grids of different rasters

I am working on a Landsat analysis script using GRASS GIS. For that, I need to focus on a certain area based on raster "landscape" using r. mask raster="landscape" cat=$foo and then run r.reclass on ...
3
votes
3answers
2k views

Clip_management to raster extent outputs larger raster than raster extent

Using Python and ArcMap 10.0 SP5, I'm trying to reproject and clip a large input raster to exactly the same grid as a smaller target raster (same extent, pixel sizes and projection). The problem is ...
3
votes
1answer
209 views

Getting source bounds when filtering LAS using PDAL?

I'm using PDAL to filter out non ground points to create a DTM along with a DSM also made through PDAL to create a Canopy Height Model using this method. My workflow looks like this. #!/bin/sh # ...
3
votes
1answer
506 views

Align Symbol to Line

I'm using ArcGIS 10.0 - ArcInfo license. I'm a fairly new user. I'd like to align rectangular symbols perpendicular to to the lines that reside nearby. I have two layers. A layer containing lines ...
3
votes
1answer
229 views

Alignment problem in 2 vector shapefiles with the same projection

I have 2 vector shapefiles of Manila that are supposed to align, but they do not (screenshot attached). I have projected them to the same projection (World Mercator WGS 84, EPSG 3395). One shapefile ...
3
votes
0answers
66 views

How can I merge roads layers that do not align perfectly?

I have multiple roads layers for a given area and would like to merge them into one layer since they each have some unique roads the other layer does not show. However, the roads that these layers ...
3
votes
0answers
255 views

Which projection can I use to see alignments on great circles?

I want to put on a QGIS map some historical sites to check if they are aligned. If an alignement exists, the points should stay on a great circle (is this correct?). I want to visually verify this ...
3
votes
1answer
404 views

List of vector to one raster in PostGIS

I need to rasterize a part of OSM map by coordinates. I found rather good algorithm, but can’t finish it. I have problems in STEP 3. I described all algorithm here – may be someone have the same task....
2
votes
1answer
77 views

USGS Relief map (GeoTIFF raster) misaligns with vector layers (QGIS)

I'm trying to correct the alignment of three layers (described below), but I'm not entirely sure how to go about re-projecting raster layers to my other layers. Ultimately my goal is to clip the ...
2
votes
1answer
634 views

QGIS Misaligned Shape with Google Maps/OSM

I am using QGIS for a project. I have started a new project from scratch within QGIS and have a set of Shape files that were given by the official government authorities. The problem is that when I ...
2
votes
2answers
383 views

kml does not overlay correctly in QGIS

In QGIS, when I insert a kml contour that was created in Google Earth, it appears misaligned in respect to all the other layers. Note in this image how the red contour is moved upwards with respect ...
2
votes
2answers
2k views

Merging many map sheets together into one large sheet for later georeferencing?

I have hundreds of images, each one is a scan of a map sheet, and I want to georeference them. The maps cover a large area (a whole country), they just split the area into many smaller cells. Each map ...
2
votes
1answer
537 views

How to realign (PostGIS) layers in QGIS?

I'm trying to realign layers in QGIS. As you can see here, the "background" light-blue layer is not aligned with the top layers. I'm working with pgAdmin III and importing PostGIS Layers in QGIS. My ...
2
votes
1answer
76 views

Fit polygons in another polygon

Is there any way to perfectly fit the blue shapes into the green shapes? I have over 7k blue shapes and 550 green shapes and I would love if someone could help me to avoid me doing all the fitting ...
2
votes
1answer
106 views

Align images with self-defined CRS in Google Earth Engine

I have uploaded a dataset to GEE and I want to align every image in the collection to have the same geographic extent as the first image of this collection. My code so far : var ref_image = ...
2
votes
1answer
93 views

GridMetrics output does not align with base DTM?

I am trying to derive grid metrics from LiDAR (.las) file using FUSION's GridMetrics tool. My problem is that the output raster from GridMetrics does not align with the base DTM used to run the tool. ...
2
votes
1answer
683 views

PostGis's ST_MapAlgebra rasters do not have the same alignment

I'm having a problem with ST_MapAlgebra. An error stating The set of rasters provided (custom extent included, if appropriate) do not have the same alignment is shown. I've been trying to know where ...
2
votes
1answer
1k views

How to align labels using Label toolbar?

I'm worried I'm missing something terribly obvious here: how do you set the alignment (left / centre / right) for feature labels? I'm referring to QGIS 1.8, and using the 'Label' toolbar, rather than ...
2
votes
1answer
72 views

Aligning two maps with different projections in QGIS

I am trying to add historic borders to a modern blank world map. The files I have are all bitmap format and the historic borders are in separate regional maps (Africa, India, North America, Western ...
2
votes
1answer
570 views

How can I improve alignment between google maps and overlays coming from a different coordinate system?

After some work, I managed to extract some PNGs out of a GIS we have at work. This GIS has some polygons in which addresses are surrounded by them. I managed to create an extractor in Python and to ...
2
votes
1answer
450 views

Align and reshape polygons based on surrounding polylines

I am trying to use a shapefile with polygons and I am trying to align it to a road network, that the polygons align themselves to surrounding streets. Is there a way to automatize alignments between ...
2
votes
1answer
475 views

Interpolated raster not aligned with the vector data

I have loaded some tab delimited text data into QGis to interpolate the points. When I get to the interpolation (IDW) part everything breaks down. The output raster file does not align with the ...
2
votes
1answer
121 views

Is there a way to define the relative position of items in print composer?

Is there any chance to make the items in print composer relative to the margins. Let's say for example the legend. I normally align it to the corner on the right bottom where the legend is 10 px away ...
2
votes
1answer
1k views

Using Google Maps, the mouse cursor and the dot on the map not inline

I'm trying to implement the example http://openlayers.org/dev/examples/drag-feature.html . When I'm implementing this with a Google map, I have a strange bug: the mouse pointer and the dot on the map ...
2
votes
0answers
227 views

How to resize a raster to the same extents of an equivalent raster?

So here's the problem I have a georeferenced orthomosaic which I used to generate land cover data. During the pixel classification phase of land cover study, I had to use other softwares to help me ...
2
votes
0answers
80 views

Aligning environmental layers causing a change in nodata values [duplicate]

I'm trying to align and re-sample environmental layers in QGIS (2.18.3). The layers I am using were obtained from the world clim data base Bio3,Bio18,Bio12,Bio10 as well as a Sheep and Cattle layer ...
2
votes
0answers
59 views

Aligning Points in Decimal Degrees

Running ArcMap 10.3 I am displaying a layer of manholes from a table coming from SQL. The XYs are in decimal degrees however they are displaying no where near my other layers (NYC PLUTO). I have ...
2
votes
0answers
575 views

How to rotate the screen in ArcGIS-Online?

I need to print out my map in ArcGISOnline, however I'm using a grid system and need to rotate the screen so that I can print each map individually and have them line up. Any thoughts on how to do ...
1
vote
3answers
602 views

ArcGIS Attribute Table - Latitude, no Longitude

I received a shapefile from an online source, and in the attribute table it shows a column and values for latitude; but there is nothing for longitude. I have not used ArcGIS for some time, and I don'...
1
vote
1answer
1k views

Aligning Multiple Objects in AutoCAD?

I want to georefrence streets in Autocad. I used _Align command for a single object, but it is not working with multiple objects. How can we align multiple objects together in autocad?