Questions tagged [scale]
The ratio between distances on a map and distances in the world
142
questions with no upvoted or accepted answers
6
votes
0
answers
217
views
Gdal Python problem: black strips in image translation
I have a 500 x 500 m resolution world map of clumping index data (He et al., 2012) and I am trying to do two things at the same time: 1) to isolate the variables per plant functional type following ...
- 61
6
votes
0
answers
6k
views
How to use Scale tool when Georeferencing Raster in ArcMap?
I'm georeferencing a bunch of maps in ArcMap 10.0. The Shift and Rotate commands are pretty easy to use, no problems there. But whenever I use the Scale command, the image completely changes ...
- 3,282
5
votes
0
answers
51
views
Get rotation and scale of picture after georeferencing using QGIS
How can I access the rotation and scaling information, that is visible during the georeferencing process in QGIS (see yellow marked text in the picture), after the georeferencing is completed and the ...
- 51
5
votes
1
answer
194
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 ...
- 787
5
votes
0
answers
637
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 ...
- 3,697
4
votes
1
answer
156
views
Synchronize QGIS layout map scale with canvas scale
Is there any option to make the map scale match the canvas scale automatically? That is without having to use the "Set map scale to match main canvas scale" button.
Actually I expected it to ...
- 41
4
votes
0
answers
536
views
Different scale of basemap after exporting to PDF/Image
After creating and exporting my map to pdf/tif obviously there are different scales of the basemap in the exported file compared to the map I created in the printcomposer. See pictures...
I am using ...
- 1,472
4
votes
0
answers
145
views
QGIS for generic surface documentation setting a custom user scale and CRS
I would like to use QGIS for the documentation of generic flat surfaces (so I don't need coordinates relative to a sphere but to a cartesian flat plane) but just overlays some images of surfaces with ...
- 2,038
3
votes
0
answers
35
views
LiDAR derived streams - map scale
Historically, streams were defined by the map scale. For example, for a map with a scale of 1:24,000 would mean that the streams identified on that map would be 1:24,000 streams.
With streams that are ...
- 31
3
votes
0
answers
134
views
QGIS - what the equivelant rendering scale dependencies for the zoom levels when generating XYZ Tiles (Mbtiles)?
I am trying to make a map from zoom 0 until zoom 12 in QGIS. All shapefiles have CRS: EPSG 900913.
What i am trying to acheive is eg: on zoom 0 will show just the map, then zoom 2 till 8 will appear ...
- 31
3
votes
0
answers
320
views
Relation of DPI to QGIS scale
I am trying to use QGIS to generate OpenStreetMap data in an older format (NTF). Since OpenStreetMap is vector, I am currently using Save Map as Image (I also tried a Print Composer) to generate ...
3
votes
0
answers
346
views
GeoServer wind speed with WMS
I have a GeoTIFF layer with spatial resolution of 3 km with two bands with wind speed components (u,v). I want to display these datasets with RasterAsPointCollection plugin with arrows size and ...
- 187
3
votes
0
answers
204
views
Creating custom scale measurement for QGIS project
I started to make a map based on a raster (a scanned paper map). The map obviously has not geographic coordinates or a projection.
The map comes with its own scale, and I would like to somehow make my ...
- 51
3
votes
3
answers
216
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 ...
- 31
3
votes
0
answers
127
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 (...
3
votes
0
answers
786
views
How to get DPI to find current scale in OpenLayers?
Is there a way to automatically retrieve the DPI value of an OpenLayers page? The goal is to automatically retrieve the map scale from this code:
function mapScale (dpi) {
var unit = map....
- 41
3
votes
0
answers
2k
views
draw map scale in geopandas
Is there a geopandas version of basemap's m.drawmapscale function?
If not, can I somehow utilize basemap's drawmapscale function within geopandas?
- 131
3
votes
0
answers
189
views
ArcObjects modify Map Scale
I'm trying to modify the scale of the map so I can further export to pdf.
The mxd document has a fixed map scale option set. The initial value is 250 and final is still 250 unchanged. The code looks ...
- 143
3
votes
0
answers
79
views
Creating a distance overlay that is computed by the distance of points/lines and recalculated on zooming
I created a fictional map and visualized it with d3. Now I would like to show a scale/rule so that the user can see which distance (kilometers,meters) he is currently using.
I was thinking about ...
- 937
3
votes
0
answers
667
views
Annotation/Label size adjusting to map scale in QGIS
I'm trying to label the street names for a map I'm working on but I do not want the labels to automatically adjust to the map scale when zooming in or out. My question is: In QGIS how do I set a fixed ...
- 411
3
votes
0
answers
616
views
How to calculate the scale of map tiles accurately?
In web maps, there are two coordinate: wgs84 geographic coordinate and web mercator project coordinate. The displayed scale of a world map is the value at equator, and one 256*256 pic can contain the ...
- 111
2
votes
0
answers
53
views
Mapnik image render not corresponding to generated tiles
I successfully manage to install a tile server using Mapnik following this tutorial: https://switch2osm.org/serving-tiles/manually-building-a-tile-server-ubuntu-22-04-lts/
The tiles are fine and look ...
- 21
2
votes
0
answers
43
views
Scale reference changes significantly when reprojected from GCS to PCS
I am using QGIS throughout this whole process.
I have a varied selection of open-sourced African spatial data (i.e. municipalities throughout Africa) that I have been trying to reproject from their ...
- 23
2
votes
0
answers
128
views
Resizing objects from Cartesian measurements to Ellipsoidal
I have been working on a project in QGIS 3.12.2 in EPSG 3857 so it works with google earth. Without realising the difference there would be between cartesian and ellipsoidal I buffered some points.
By ...
- 21
2
votes
0
answers
39
views
Making Symbology Scales same in ArcMap
I am using two sets of data, 'Part' and 'Total'. The part set is what you would think, a fraction of the total. Part = 13 , Total = 29.
I want to overlap this data on a map using Graduated Symbols but ...
- 69
2
votes
0
answers
194
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/...
2
votes
1
answer
163
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 ...
- 29
2
votes
0
answers
583
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 ...
- 930
2
votes
0
answers
96
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 ...
- 125
2
votes
0
answers
398
views
Invert the legend scale representation [in R environment]
Through the following code,
cols <- (heat.colors(255))
plot(raster_sum3, col=cols[round(seq(1,255,length.out=10))], legend=TRUE) # raster of the study area
plot(site_3003, add=TRUE) # site ...
- 345
2
votes
0
answers
580
views
OpenLayers, WMS MinScaleDenominator and MaxScaleDenominator
In my OpenLayers map application I display many WMS layers from different sources. Some of them have display scale restrictions set by MinScaleDenominator and MaxScaleDenominator tags in WMS ...
- 65
2
votes
0
answers
303
views
Handling "exact" scale close to layer's minScale/maxScale in ArcGIS js api
We deliver web apps for our customer based on common platform which in turn is developed on top of ArcGIS JS API 3. Customers publish their map layers to get whatever maps they need.
Customers have ...
2
votes
0
answers
1k
views
Calculate Bounding Box from Center at scale
So I was trying to find my answer in Calculating bounding box by given center and scale in Android?
And below is what I've implemented (Ruby) with the size heigh/width in pixels being the same as a ...
- 307
2
votes
0
answers
160
views
QGIS Units and Scale
I am exploring QGIS 2.10.1-Pisa for the first time. I'm familiar with ArcMap, but I need to explore QGIS as an alternative.
I am having a hard time trying to figure out the units and scale situation. ...
- 21
2
votes
0
answers
81
views
Disabling Extent Based Rendering using ESRI Javascript API
I am using ESRI's javascript API to generate a heatmap renderer for my feature layer. I am noticing that the heatmap calculation/visualization is dependent upon what is in the current zoom extent. For ...
- 131
2
votes
0
answers
3k
views
How to get bounds coords by center LatLng point, width and height in pixels and zoom?
I have to calculate bounds coordinates to query mongodb box on server side to get data before google maps is loaded.
How can I get four LatLng corners by center LatLng point, window width and height ...
- 131
2
votes
0
answers
52
views
How can I manipulate the number of points visible according to scale?
I've gotten trillions of points extracted from a DEM and they are to be labelled. It's fine at scales such as 1:500 but it gets too cluttered especially if I need to make maps of this with scales up ...
- 162
2
votes
0
answers
503
views
QGIS Web Client zoom and scale
I have a problem with setting up zoom levels and max/min scale in QGIS web client. It looks like that values used in GlobalOptions.js file does not apply. Right now ZOOM_LEVELS is 70, maxScale 50 and ...
- 81
2
votes
0
answers
211
views
Choosing the map scale (1:nnn) for the given raster dimension
Starting points:
let define the raster image size, say: 1800x900 pixels
I want draw my own raster image map - by drawing polygons e.g. like "draw line from pixel with coordinates x100y100 to pixel ...
- 121
2
votes
0
answers
436
views
Mapfish printing application from Openlayers : disableScaleLocking
Mapfish printing application from Openlayers: I get the following error when I use a different scale than the scales defined in the config.yaml even though I am using disableScaleLocking: true
...
- 177
2
votes
0
answers
274
views
Set scale for labels
I have multiple shapefiles with different geometry and I am trying to add a label of layers.
For creating a map I am using GeoServer and OpenLayers.
Requirement is layer are visible on a max zoom ...
- 101
2
votes
0
answers
2k
views
How to zoom exactly to a desired scale in Flex?
I am using ArcGIS API for flex 2.4 with ArcGIS server 10. I am trying to write the widget where user can define the map scale (type it in text box) and it will zoom to that scale. I successfully ...
- 21
2
votes
1
answer
279
views
Sentinel-3 scaling factor in Google Earth Engine
Does anybody know how to use the scaling factors from Google Earth Engine with Sentinel-3 dataset?
The band values provided in ee.ImageCollection("COPERNICUS/S3/OLCI" by default (GEE, orange)...
2
votes
1
answer
307
views
QGIS : How to make pie charts that depict quantity on certain coordinates/site?
Does anyone know how to create a map such as this one in QGIS? In short, if we have a table with list of sites with coordinates and and one column with numbers dedicated to μg /g according to which ...
- 21
1
vote
0
answers
24
views
ArcMap maps don't print at exactly 1:24000 scale
I'm printing out USGS topo maps, that when printed should be in at a 1:24,000 scale. However, when measuring the physically printed maps, the 1 mile scale bar does not match my physical 1:24,000 ruler ...
- 21
1
vote
0
answers
31
views
Problem exporting contour lines between QGIS and Rhino (or AutoCAD)
I am a French student studying architecture in Mexico. Currently, I am trying to retrieve contour lines in QGIS from a raster (.tiff) to export them to Rhino 7.
Processes:
I import my raster file (it ...
- 11
1
vote
1
answer
76
views
Arcpy : setting DataFrame scale to export map over specific domain
I am trying to automate the export of a map to png over a given domain (SW and NE coordinates) in ArcPy (ArcMap version 10.7.1). I've searched a bit but fail at setting the correct automatized scale (...
- 11
1
vote
0
answers
97
views
Layout Manager and Map Size
I am trying to create two really simple maps with the QGIS Layout Manager. I can adjust the size of the map with scale and the extents - but why is there that blank white space around, and why is the ...
- 59
1
vote
1
answer
43
views
Setting an explicit scale when translating GeoTIFF to PNG
When converting to PNG I'd like to convert the height of the GeoTIFF (which is a float) to UINT16, but also setting the maximum range to 5500, by clamping any values smaller or larger to min or max ...
- 21
1
vote
0
answers
43
views
Scale and data precision
In the metadata of a database containing locations of natural hazards, it appears that the accuracy of the georeferencing of each point is associated with a scale of 1:10,000.
How can I associate this ...
- 671