Questions tagged [scale]

The ratio between distances on a map and distances in the world

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22 views

How to calculate scale from zoom level in Google Earth Engine?

I found the following formula on the interwebs, including on some google group from someone claiming to work at Google: var scale = 156543.03392 * Math.cos(mapCenter.lat * Math.PI / 180) / Math.pow(2,...
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33 views

QGIS DXF measurements in AutoCAD are in Cartesian and not Ellipsoidal

I'm trying to export some land boundary polygons to AutoCAD using the Export to DXF function. The issue I am having is that the distance measurements in AutoCAD, of the exported DXF file, represent ...
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39 views

Map output with multiple “Zoom Levels” in QGIS 3 [duplicate]

Just wondered if it is possible to do BBC-style multiple "Zoom Levels" output in QGIS 3 like this: I used to use another app such as Adobe Illustrator to overlay the maps of different scales. ...
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2answers
59 views

How to make the display of a satellite image the same across users?

I have a group of users counting objects in a satellite image. To keep viewing conditions the same I wish each user to have the same display (e.g., the same scale). To do this, I have asked users to ...
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1answer
48 views

Scale feature in QGIS

I am trying to scale (up and down) feature(s), similar to ArcGIS where the first click specifies the scale reference point and the second click specifies the scale factor, but couldn't find a solution ...
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3answers
117 views

Re-scale and move vector layer manually in QGIS

I have imported a dxf file (site layout drawings for proposed development), but its scaling is too small and it does not line up with the google street maps. I want to re-scale the layer manually ...
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1answer
48 views

QGIS - Scale bar segments

Is it possible to divide a QGIS scale bar into different sized segments as you can in MapInfo (as with example given). Or is it possible to select different style of scale bars in QGIS? If it's not ...
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1answer
32 views

Too many pixels in Earth Engine, and scale parameter meaning

I am trying to calculate stadistics for burn areas based on the number of pixels. When running the code, GEE says too many pixels, I tried to solve it following the guides given by google developers ...
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36 views

Rescale 300 polygons within one shapefile, but keeping the original center position of each polygon

I have a shapefile type Fishnet in ArcMap, containing 300 or so polygons in it. Each polygon represent an area of interest containing plants. I have a model extracting the zonal stats of the shapefile ...
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58 views

Extracting Point data from MODIS with Sinusoidal Projection in Google Earth Engine? (crs:SR-ORG:6974)

I am using Google Earth Engine and my aim is to extract pixel values of MODIS land surface temperature (MOD11A1) at my points of interest with the best accuracy. MOD11A1 data has a pixel size of about ...
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1answer
24 views

QGIS different scale levels in rule-based styling - in one rule

I have a layer with 4 roadclasses. For this layer I created a rule based symbolization, with 4 rules. In every rule I filter another roadclass and set a different symbolization and scale for this rule....
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39 views

Raster merge in QGIS deletes scale

I try to merge 2 raster tiffs in QGIS 3.10 (Raster-Miscellaneuous-Merge). The merge is executed but the resulting map is just black, the scale is set to 0, i.e. all the information of the rasters is ...
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2answers
97 views

Printing to scale in QGIS

I want to print a map to scale on 11x17 paper. I understand you can change the scale bar to 'numeric' in print composer, and then set the scale under properties for the map. What I want to know is ...
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2answers
68 views

Export raster to PNG in 1:1 scale from QGIS?

The raster I have is 1m LiDAR data that's been patched and properly color corrected. The resolution of it should already be 1m/pixel. The coordinate system is properly set, the measure tool measures ...
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1answer
38 views

Is climate a small-scale or large-scale process? [closed]

This might sound like a stupid question but it bothers me anyway: We distinguish small-scale maps like world-maps and large-scale maps like a map of my local neighborhood. So far, so clear. However, ...
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47 views

How to have the same scale for two maps? [closed]

I'm using QGIS 2.8.1. I have one raster map with rainfall data with 1:3 scale when zoomed to layer. There's another vector map with points which in scale 1:221,691 when zoomed to layer. Both are ...
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2answers
145 views

Access QGIS rendering map context within QGIS Python function

I maintain the maps for my local Nordic ski trails. Each winter during the 'Tour de Soup' skiers travel from one soup station to another with the aid of a special event map. Because the map is ...
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79 views

QGIS 3.4 Layout manager, attribute table, scale of map

I am trying to produce maps faster than I currently do. I was thinking to use the "show only features visible within a map" option. I already use it for the coordinates table and I am trying to add ...
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1answer
180 views

Getting current map scale in PyQGIS

I'm trying to get the current map scale in PyQGIS, running outside QGIS, with: project = QgsProject.instance() root = project.layerTreeRoot() canvas = QgsMapCanvas() bridge = ...
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52 views

Different distance when using “Measure Line” tool and manually with scale in QGIS 3

Using QGIS's "Measure Line" tool I get a distance of 1.22km between two points. But if I use the scale indicated at the bottom of the screen, 1:50000, and measure with a ruler, the distance is 2.5km (...
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1answer
43 views

How to count pixels in patches of the Global Surface Water Layer (JRC)

I'm using the GlobalSurfaceWater-Dataset in GEE for creating a mask layer. The mask I do need should only contain water areas bigger than a certain threshold, so I need to get an information on the ...
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1answer
72 views

QGIS 3.4.12 print composer, cm distance

In print composer, I would like to syncronize the scale of the map with the Grid scale. For example, in print composer I am making a map in 1/1000 scale, so I go to grid,and insert "map units" x=100 y=...
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89 views

Understanding scale of Google Maps

I have found that the map section shown on one viewing is not the same as shown on a second viewing. The same designated scale produces different dimensions in the second viewing and places that are ...
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1answer
31 views

At what scale does the senitel 2a make the image? [closed]

I have to show scale in my reports, so I need to know. Please bother to tell me.
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29 views

Setting separator of thousands in QGIS Print Composer [duplicate]

I want to create a map with a numeric scale. Is it possible to set separators between thousands, like 1:1.000.000?
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0answers
79 views

Mean reducer changes scale in Google Earth Engine?

I am working with NOAA CFSV2 data trying to get an Image that is a one-year average of an ImageCollection. However, in the process the scale of an image changes: var uv = ee.ImageCollection('NOAA/...
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1answer
140 views

Difficulty with Scaled Visibility for Labels in QGIS 3.4.9

I am having great fun getting to grips with QGIS (fantastic). I have set myself a "project" to try to learn the techniques. This project refers to 2 Layers (geographic areas for Telephone Exchanges ...
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0answers
26 views

Log Scale Contouring in ArcMap?

I have a shapefile of concentration values, they range from 0 7000. I want to either contour or display these in log scale (0.1, 1, 10, 100 and 1000) what is the best way of doing this? I have about ...
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1answer
81 views

Dividing country into maps of scale 1:25000 (metres)?

I want to divide a country into a grid of maps that will be of 1:25000 scale. I am not sure how to approach this. Create fishnet seems like a good ending point. I have some old maps of the given scale....
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1answer
50 views

Keep the same image scale after mosaicking

I am trying to keep the same original image scale after creating a mosaic with the same images. But when I try to add in a map this image I can´t configure the visualized parameters. The problem is ...
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1answer
58 views

Converting stream definition threshold to extract drainage network to metric scale?

I extracted two drainage networks from a DEM of 30 meters resolution with two stream definition thresholds: 1000 pixels and 500 pixels. Can you tell me what this thresholds represent in terms of ...
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1answer
49 views

Locating date, scale, and coordinate system of shapefile in ArcMap?

I am trying to locate the date, scale, and coordinate system/projection of a shapefile in ArcMap but when I right click on the file in the table of contents and go to properties, I don't see the date ...
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1answer
87 views

Increase max zoom for large scale raster with GeoServer

I'm serving a large scale raster (warehouse map) with GeoServer. I consume the WMS in a Leaflet web client and coordinates are projected according to EPSG:3857. But it seems that maximum zoom is ...
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80 views

Scaling WGS84 coordinates?

I know this is a weird question, but I would like to know if it is possible to construct a proj4 string so that I can use proj4 to convert from WGS84 to a "scaled" WGS84 system. For example with a ...
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1answer
205 views

Scale of shape in a Print Layout

I am making an atlas with a fixed scale, and want to include circles with a fixed radius (in scaled kilometers) about the center point in the atlas (see image below). I was able to do this by ...
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0answers
27 views

Creating Scale field based on polyline length (ArcMap)(Python)

I'm playing around with data driven pages, and have a polyline feature class that I'm using as my index. Now, because the lines are all of variable lengths I can't just use the default settings as ...
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1answer
557 views

What is WMTS' ScaleDenominator?

I am trying to write a program which will render tiles from EPSG2180-based WMTS server. Given coordinates of a point (WSG84 or EPSG2180, I can convert from one to another) I want to render a tile ...
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0answers
31 views

zoomScale() doesn't work in QGIS 2.14 standalone c++ application

Can't set scale for my canvas with mapCanvas.zoomScale(50000); Seems like canvas is zooming to 1:1 and for a few seconds I can't zoom in or zoom out with mouse wheel. Any suggestions?
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1answer
55 views

Adjust label/symbol size in print composer automatically when choosing different scale for atlas

I am having trouble with my labels/symbols in the print composer and didn't find a solution here so far. I have a project with a certain area from which I have to create several layouts in the print ...
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0answers
223 views

Understanding projection, extent and scale in QGIS?

I am creating a map using QGIS that has shapefiles in different projections. I was able to reproject them to the correct ESPG code that I need, however they do not line up. My base layer "illinois ...
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1answer
105 views

QGIS3 How to export shapefile symbology to scale?

I'm looking how to export in QGIS3 a vector layer with a determined scale. It was straightforward in QGIS2 when I was exporting to a shapefile I had the option symbology scale but it disapear in QGIS3 ...
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0answers
64 views

Interpreting meter values of extent using ArcGIS Pro?

I am using ArcGIS Pro application to create a map and add a single polygon feature class onto the map. As shown below, I use bold polyline to outline the boundary of the polygon and click "zoom to ...
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0answers
78 views

Raster Resolution - Will not display past certain scale

I just created a mosaic of a couple hundred digital elevation models in ArcGIS desktop. The mosaic only appears at the raster resolution. I am working with a very large area and need the scale of my ...
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1answer
1k views

QGIS 3.2 - How can I scale polygon about his center? [duplicate]

How can I scale a polygon about his center? I find only transform function, but the scale function here can only move the polygon with the scale factor and don't enlarge it.
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1answer
206 views

Scale bar for Iceland map not accurate

I'm a fairly new user to QGIS and was trying to generate a map of Iceland. However my grid scales are not matching up. The base map I'm using is Esri National Geographic which uses CRS- EPSG:3857 - ...
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43 views

Trying to figure out ArcGIS API's `mapScale` variable and how it maps to OpenStreetMap's zoom level

I'm using ArcGIS' /export endpoint to get an .svg of a few map layers given a specific bounding box. However, when I apply the .svg as an image overlay to OpenStreetMap's world map using Leaflet, the ...
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0answers
435 views

Print Openlayers WMS map with fixed scaling

I need to print a map with a fixed scale (1:500 and 1:1000) on A4. The online map is done with Openlayers, the print request is sent to QGIS Server using WMS getPrint function. I mange to get an ...
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1answer
195 views

QGIS Print composer using margin and scale

When using the Atlas feature in the print composer is there any way of using both the Margin around feature and a defined scale?
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0answers
54 views

AGOL: Overwrite existing tile service - Invalid min scale in the specified source item

I'm trying to automate updating a tile service where: TPK is generated from a feature class in an .mxd (data frame is web mercator) TPK is pushed up to AGOL Tile Service is published TPK is deleted ...
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0answers
289 views

QGIS 3.4 layout: fix extent and scale, let size adjust automatically

I'd like to create maps with a defined extent and scale. Logically, the map size has to adjust accordingly. Since I will be using the maps as pdfs (and not on paper), this won't bother me. Is this ...

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