Questions tagged [scale]

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

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2answers
36 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
33 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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0answers
38 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
139 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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0answers
37 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 ...
2
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1answer
72 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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0answers
49 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 (...
1
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1answer
29 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
45 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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0answers
43 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
29 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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0answers
28 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
46 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
82 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
22 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
58 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
42 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 ...
0
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1answer
23 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 ...
1
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1answer
48 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 ...
0
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1answer
58 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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0answers
60 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 ...
1
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1answer
129 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
23 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 ...
3
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1answer
335 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
26 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
45 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
140 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
71 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
51 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
56 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 ...
3
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1answer
765 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.
2
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1answer
164 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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0answers
41 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
348 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
133 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
46 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
227 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 ...
0
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1answer
238 views

Earth Engine export scale interpretation

I'm exporting a Landsat RGB image from Earth Engine. I want to use the full native resolution (30-m pixels) in the output file. However, it seems that using 30 in the scale argument fails to export at ...
3
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0answers
80 views

Changing legend spacing to be further away from map border in QGIS?

I am using QGIS 3.2.3 I am creating a map in which I have added a legend to (see figure below). My issue is that I am trying to create a legend which has spacing between the two columns. I have ...
0
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1answer
372 views

Scale issues with Google Roads XYZ tiles in QGIS layout

I am trying to include Google Roads as XYZ Tiles in QGIS in a map that I want to export as PDF as a Layout. Google roads features and the text looks ok on QGIS and in the Layout, however, after I ...
1
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0answers
102 views

Which is the View.getResolution() units? [duplicate]

In OpenLayers v5, if I have a view defined like this: var view = new View({ center: [952014.59, 5571269.68], zoom: 8 }); , trying to get its resolution doing view.getResolution() outputs 611....
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1answer
56 views

Appropriate resolution for regression analysis

I'm using ArcMap 10.3. I'm a student working on a research problem where I'm taking Landsat imagery (at 30-meters resolution) and regressing it against other datasets captured at different scales (up ...
2
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0answers
306 views

How to get extent from current resolution in OpenLayers 3 for printing

I need to print a map with a fixed scale of 1:500 horizontally on a A4 paper (297x210mm). The map is done with Openlayers, the print request is sent to QGIS server using WMS getPrint function. Till ...
3
votes
1answer
69 views

Can you make QGIS decorations scale dependent?

I have a QGIS project that includes a grid decoration. Is it possible to display this decoration only when zoomed in? I.e. can decorations in QGIS have scale dependent visibility?
2
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2answers
346 views

How to scale features declining using map units in QGIS

I have layer in QGIS that I want to style using SVG symbols. I want the SVGs to increase in size when zooming in the map. I can solve this by using map units instead of millimeters. Though, I don't ...
3
votes
0answers
118 views

WMS - understanding <Min> and <MaxScaleDenominator>

I am working on a personal web gis client and the first thing I am implementing is support for OGC WMS 1.3.0. Right now, I am in the middle of greying out layers in my layer tree which are not ...
2
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0answers
48 views

Assessing impact of spatial scale on derivative calculations and associated kernel size?

Full question: What is the most appropriate way to assess the impact of spatial scale on derivative calculations associated with typical 3x3 moving window kernel operations? This relates to a couple ...
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1answer
31 views

Custom Projection and Alignment of Large-Scale RGB Time Series Mosaics

We are running an experiment to observe time to germination and growth in potato plants in a greenhouse. To that end we have built a gantry system equipped with an RGB camera to capture the plants ...
1
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1answer
235 views

GeoServer - Conversion formula between scale and resolution

I am trying to figure out what is the conversion formula between scale and resolution used by GeoServer, specifically when creating a new gridset for Tile Caching. One would expect that the conversion ...
1
vote
1answer
537 views

Setting fixed scale of map in MapInfo layout?

How do I set the scale of a map in MapInfo v16 64bit in a simple way? I can zoom in and out using my mouse but I cannot find how to set the scale to say 1:1000 or 1:2000.