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Questions tagged [scale]

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

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119 votes
14 answers
312k views

What ratio scales do Google Maps zoom levels correspond to?

Can anyone provide me with a link (or some details) on the actual ratio to "zoom level" figures for Google Maps? e.g. Google Maps Level 13 = 1:20000
mlo55's user avatar
  • 1,341
15 votes
3 answers
9k views

Changing symbology at different scales in ArcMap?

I am using ArcMap 10 and I want to display my village parcel symbology differently at given scales. I have one idea to copy and paste same layer. But my question is that in a single layer, is it ...
user876307's user avatar
14 votes
2 answers
832 views

How to translate John Snow data sets to map coordinates

In the HistData package for R (https://r-forge.r-project.org/R/?group_id=574) I have the data sets related to John Snow's map of the cholera outbreak in London, 1854. I believe they are authoritative,...
user101089's user avatar
13 votes
1 answer
528 views

Scale in printed map (mxd) is different in code to manual printing

This question is related in part to a previous question I have asked. I have tried printing an A3 mxd with the Print Active View code as published by ESRI and have changed only one line of code and ...
Vidar's user avatar
  • 1,870
12 votes
2 answers
9k views

Scale and Z factor have no effect on hillshade analysis in QGIS

I used an SRTM DEM to create a hillshade in QGIS 2.2.0. However, the resultant hillshade seems to be vertically exaggerated. Also, changing the settings for scale and z-factor does not have any effect ...
PyMapr's user avatar
  • 1,650
12 votes
2 answers
2k views

Surface distance on DEM between two coordinates

Given two coordinates on a digital elevation model (DEM), how do I compute the actual distance traveled between the two locations, assuming a straight line route? How will changing the resolution of ...
scw's user avatar
  • 16.4k
12 votes
4 answers
842 views

How to generalize coastlines?

I have a large set of data points that essentially represent the coastline of the world. I don't know the exact resolution but I'd say it's in the neighbourhood of 5-10m. Imagine a set of points ...
Stephan 's user avatar
12 votes
4 answers
27k views

Importing, moving, rotating and scaling jpg images onto OSM maps in QGIS

I'm a master planner and I want to use QGIS for, among others, importing images (jpg, png, etc without any georeferences). These images will mostly be screenshots of existing structures in Google ...
Steven's user avatar
  • 121
11 votes
1 answer
3k views

Different layer styles at different scales in QGIS?

I would like to be able to show a basic style for a layer at a large scale, e.g. GB-wide, with all polygons the same, but for this to change at a smaller scale, e.g. 1:25K, to differentiate between ...
JimS-W's user avatar
  • 359
11 votes
2 answers
42k views

How to get current scale of a Leaflet map?

I've been looking through the Leaflet API to see if there is a getScale method or scale property of a map, and have't seen anything. Does anyone know if Leaflet provides a way to get the current map ...
user714157's user avatar
11 votes
2 answers
4k views

Putting scale bar labels below scale bar in QGIS?

I added two scale elements to my map composition. For layout harmonisation, I want the ticks and the label text below the scale bar. Standard is this: What I want is this (manually changed in the ...
aae's user avatar
  • 377
11 votes
5 answers
10k views

What are standard scales, or zoom levels, for map applications?

I am working on an ArcEngine program that is restricted to a set of scales. It currently has: 1:187.5 1:375 1:750 1:1500 1:3000 1:6000 1:12000 1:24000 1:50000 1:100000 I don't think there's anything ...
Tanner's user avatar
  • 7,383
11 votes
2 answers
3k views

Fistance when viewing scaled-topographic map

A close friend from my company asked me a question about a topographic scaled map (1:25.000): What was the altitude to a location in km (as you are viewing Earth from space) when he was viewing the ...
urcm's user avatar
  • 22.5k
10 votes
2 answers
1k views

Data defined label position for more than one scale in one layer

I'm looking for a better labeling-solution for my projects. It seems to be difficult - but maybe I'm just blind? My projects: I build printed bike-hike-books. The main scale is 1:75k and there are ...
MartinMap's user avatar
  • 8,338
10 votes
2 answers
6k views

How to create a vertical scale bar in ArcMap?

Wondering if anyone out there knows how to create a vertical scale bar in ArcMap? With text I can adjust the angle. Is this possible with a scale bar as well?
Sue Deforest's user avatar
9 votes
1 answer
10k views

Calculating bounding box by given center and scale in Android?

Given these conditions: a scale like 1:50000 the center of the viewport is 100°E, 20°N the size of the viewport is 400x600 How can I calculate the bounding box of the viewport? The geographic ...
giser's user avatar
  • 761
9 votes
0 answers
281 views

How do ESRI and QGIS calculate scale values of geographic projections? [closed]

Does anyone know how (from which location) scale values are calculated in ESRI products and QGIS for geographic projections? The only thing I've noticed is that QGIS is changing scales when you pan ...
Karol Kolenda's user avatar
8 votes
6 answers
3k views

Maps zoomed around specific locations (magnifying glass effect)

How do I create a static map where the scale varies based on location? Example: to drive from a specific location X in Albuquerque to a specific location Y in Chicago, I want to "zoom" around X and ...
user avatar
8 votes
2 answers
22k views

OpenLayers: Use scales instead of resolutions

Venturing around in the OpenLayers source code, it seems like everything related to zoom-levels is done using resolutions. Fair enough since this related directly to screen space. I would like ...
Chau's user avatar
  • 4,490
8 votes
3 answers
4k views

QGIS Print composer scale problems

I'm having trouble printing a map with a desired scale. I set the scale to 1:100,000. The page size is 30x30 cm, therefore the real world map extent should be 30x30 km. However, as one can see with ...
lmoe's user avatar
  • 83
8 votes
1 answer
3k views

Is it possible to set different scale dependent visibility for one layer classifications?

I'm working on a sewer and water network, so I need to set different scale visibility for primary, secondary and tertiary network.
Kevin Malone's user avatar
8 votes
2 answers
2k views

How to use scale-rule based renderer in QGIS?

I wish to render a shapefile of buildings such that at scales below 1:5000, they have a border, and above 1:5000, they do not have a border. For this, I went into layer properties, selected Rule-...
Devdatta Tengshe's user avatar
8 votes
2 answers
732 views

Enlarging polygons only on two sides using ArcGIS Desktop?

I want to enlarge a line of polygons only on the sides but I only found tools like "scale" or "buffer" which extend the whole polygon and not only widen them. The problem with ...
Mirjam's user avatar
  • 95
7 votes
2 answers
7k views

Calculate scale of a raster

A raster has a cell size of 200 meters. What is the corresponding scale of the raster? New to GIS, using ESRI, semester is almost over but this one question is confusing. I didn't think you could ...
Keith's user avatar
  • 121
7 votes
3 answers
8k views

Using GIS for Interactive Floor Plan

GIS is brand new to me, but I've spent a couple of days researching so that I can at least ask somewhat intelligent questions. I've decided to use QGIS I need to do an interactive floor plan on the ...
Jacques's user avatar
  • 183
7 votes
1 answer
1k views

Scale difference between WGS84 WebMercator and Lambert projection

There's something I don't understand: I have a map in ArcMap in Lambert RGF93 projection (conic projection system for France) at scale 1:10000 then I change the coordinate system to WGS84 WebMercator ...
superrache's user avatar
7 votes
1 answer
4k views

How to automatically generate useful scales for data driven pages in ArcGIS desktop

I have been tasked with creating several hundred maps of properties that intersect a long pipeline. The maps will zoom to the part of the property which shows the intersection. The lengths of ...
Fezter's user avatar
  • 21.9k
7 votes
3 answers
503 views

How to handle display of nested polygons (census, county/state, etc) for a given map extent

My question is how best to decide which layer (from a set of nested, aggregated census polygons) to display for any given map extent in an online map. Australia's census boundaries are built from ...
Stephen Lead's user avatar
  • 21.2k
7 votes
2 answers
377 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 ...
tomfumb's user avatar
  • 3,688
7 votes
2 answers
584 views

What does map scale refer to in map making / field survey metadata?

If I have, say, a printed map at the scale of 1:20000 and the legend says that it was mapped at a scale of 1:10000 does this simply mean, that the surveyors/cartographers made drafts & sketches or ...
Torsti's user avatar
  • 524
6 votes
2 answers
18k views

Arcmap 10 feature with undefined coordinate system projects incorrectly when projecton is defined

I'm fairly new to GIS, and am slowly feeling my way through ArcMap 10. I have run across a problem defining the Geographic Coordinate System and projection for a feature (the feature currently has an ...
Ben F's user avatar
  • 91
6 votes
1 answer
3k 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 ...
hugo's user avatar
  • 181
6 votes
5 answers
3k views

Re-scaling and moving 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 ...
Reinier's user avatar
  • 89
6 votes
2 answers
10k views

How to check my EPSG and units in R when it is not defined in proj4string?

After reading my .shp in R using readOGR(), I tried to figure out what is my EPSG and what are my units in my projections? when I tape my.shp = readOGR(dsn=setwd(dsn = dsn, my....
maycca's user avatar
  • 3,376
6 votes
2 answers
2k views

What does Scale mean in the reference of Desktop GIS or WebGIS?

I'm having trouble understanding the meaning of the concept of scale when it comes to maps on screen, i.e. either in a Desktop GIS or in a WebMap. When it comes to paper maps, the idea is very clear. ...
Devdatta Tengshe's user avatar
6 votes
4 answers
4k views

Rasters added to mosaic dataset only display at large acale

I have a set of 357 rasters in .jp2 that I've added to a mosaic dataset. All but 7 of them display properly, but the 7 only display at larger scales, around 1:6500 and under. I've tried adding them ...
recurvata's user avatar
  • 2,290
6 votes
1 answer
11k views

Leaflet - CRS.Simple custom scale?

I am displaying a gamemap using Leaflet. The map is nonwrapping. I use L.CRS.Simple which is recommended for this (and makes sense). I add multiple tilelayers, each created using gdal2tiles. The ...
Senshi's user avatar
  • 1,767
6 votes
1 answer
289 views

Set minimum scale on QGis Print composer (atlas)

I have a template ready to be printed on Print composer tool of Qgis. I need to fix a minimum scale while figures are represented one by one (1:10000) I would like to combine the scale tool controled ...
Coldon's user avatar
  • 187
6 votes
0 answers
77 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 ...
automatikz's user avatar
6 votes
1 answer
237 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 ...
Louis Tate's user avatar
6 votes
0 answers
228 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 ...
Renato's user avatar
  • 61
6 votes
0 answers
165 views

Scaling x y coordinates in qgis print composer while using atlas generator [duplicate]

So I am using QGIS 2.18.0 and have made a map template that uses the atlas generator in the print composer. It uses the grids settings for the map to add UTM north and Eastings along the sides of the ...
Reid Graham's user avatar
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 ...
cndnflyr's user avatar
  • 3,412
5 votes
3 answers
7k views

Zoom map to a scale in Leaflet

I am preparing a printable map in leaflet. For this purpose I would like to make a map zoom to a particular scale eg. 1:500 or 1:1000. But Leaflet zooms a map based on the extend and zoom level only. ...
poshan's user avatar
  • 761
5 votes
2 answers
29k views

How to calculate pixels per meter ratio, according to Google or Bing map zoom level?

I have an image and detect two points in the image. I want to calculate the distance between these two points. I'm using Google map and Bing map. I have x,y pixel values for both two points zoom ...
Penergy's user avatar
  • 51
5 votes
1 answer
1k views

Fixing distortions in rendered OpenStreetMap maps?

I use OpenStreetMap in order to generate maps and add some cool stuff in it. Actually I have good results but I seem to have a problem with reporting a good image ratio when I create my generated file....
lvictorino's user avatar
5 votes
1 answer
2k views

Locking the scale while resizing the panels in QGIS

QGIS changes map canvas scale while resizing the panels. I use iface.mapCanvas().setScaleLocked(True) to lock the scale. Is there a manual option to lock the scale in "Settings"?
Kadir Şahbaz's user avatar
5 votes
3 answers
1k views

How to know if shapefile is georeferenced?

I have a shapefile which is located in province in indonesia. it contains many sub-province if i removed sub regions inside a shapefile, and it leaves a small region, and my question is that small ...
Q Shofwan Muhammad's user avatar
5 votes
1 answer
317 views

Scaling linestrings gives incorrected final scale

I have a shapefile with about 5000 line strings. I am translating and scaling this file using GeoPandas: import geopandas green = geopandas.read_file('./shapefiles/unnamed (1)_green.shp') The ...
ali bakhtiari's user avatar
5 votes
1 answer
3k views

Calculating Leaflet scale ratio for the particular zoom level?

Is there any way we can calculate the scale ratio using L.CRS.scale? For example, if I execute the following code L.CRS.scale(this._map.getZoom()), the pixel coordinates value for a particular zoom ...
BJoy's user avatar
  • 73

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