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

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0
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2answers
19 views

How to filter features based on scale?

Shape file has visibility attribute. This attribute is generated by algorithm and there is a manual override. In QGIS, is there a way to apply global (per project) or local (per layer) filtering to ...
0
votes
0answers
8 views

Interpreting Shapefile metadata to use in World File

Im currently using gdal/ogr to read metadata concerning shapefiles and I am able to read them correctly. I am also able to convert these shapefiles to tif using QGIS and now the next step I need is to ...
1
vote
1answer
775 views

Setting a scale range for labels in KML files

Is there a way for labels to be displayed in KML only when zoomed in (or out) beyond a certain scale range, just as it is possible in ArcGIS? If exporting to KML from ArcGIS, I guess the first step is ...
0
votes
0answers
27 views

Determining scale of downloaded data (shapefile, raster, etc)?

When downloading digital data (either shapefile, raster, layer, GDB etc.) how do you determine the scales? Is there a simple way? I know scale definitions are different for geographers and ...
0
votes
1answer
32 views

Meaning&Computation of range property in CMAPI map.view.zoom message

We are implementing a CMAPI 1.3.0 programming interface to abstract basic Gis commands from the actual Gis library underneath (Luciad Lightspeed 2016.0). In the map.view.zoom command, I don't ...
0
votes
1answer
249 views

How to calculate a map scale with bounding box, width and height?

I have a map that will allow the user to select or slice images/pictures out of it. As example a map width is 1200px * 1200px and the user selects say 700px x 700px square (note: aspect ratio is ...
1
vote
1answer
237 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 ...
7
votes
1answer
2k 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 ...
1
vote
1answer
18 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 ...
2
votes
0answers
224 views

Use ArcPy to identify annotation reference scale? [closed]

I would like to retrieve the value of an annotation feature class reference scale using ArcPy (under ArcGIS 10.1). I cannot find where this property is stored (tried to access using the describe ...
1
vote
1answer
39 views

Georeferenced images gives wrong scale

When I georeference satellite images with a CRS for my region (Hartebeeshoek94), I get a scale of 1:10 and larger. But when I use WGS84 the scale appears correct, e.g. 1:50 000. I am using QGIS v2.13....
1
vote
1answer
397 views

ScaleLine shows NaN for LCC projection

I have used openlayers along with geoserver. My Map is having LCC projection by default, but SRS is EPSG:4042. The problem is that the scaleline shows NaN in meter as well as feet. How can I correct ...
1
vote
1answer
75 views

On a map of the globe that is 1920x1080px, how big would each pixel be?

I heard from one source 21km square, and from another 245km square...
2
votes
2answers
179 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 ...
2
votes
2answers
41 views

Digitization scale

What is the relationship between the map scale and the digitization scale? Is there any rule? In my case, I'm making a map at 1:35'000. At what scale would you digitize the roads from satelite image?
1
vote
1answer
89 views

Web site for plan upload and measure

I've got plans of my house and a warehouse on paper. I would like to scan them in JPEG, import them on my PC and measure them. I'm looking for a website where I can upload those tiff, jpeg or pdf ...
2
votes
2answers
640 views

Maximum scale dependent visibility changes from 1:0 to -2147483648:1

QGIS 2.0.1 Dufour. When i open the layer properties and the scale dependent visibility is unchecked and when i check it, the maximum (inclusive) shows 1:0. I click Apply, OK, reopen layer properties ...
1
vote
1answer
38 views

QGIS 2.81. Why can i only see my whole polygon and nothing if i zoom in

I have a polygon layer with one object. It is a flood inundation map. I could see my layer all the time in every scale factor. From one moment to the other it changed and know it is only visible if i ...
1
vote
1answer
18 views

Shortcut to display scale from cache in qgis print composter

Bit of a tricky question, not sure if this can be done. When loading a map in the print composer I always click on the main area where the map displays, then click on 'set to map canvas extent'. Then ...
1
vote
0answers
20 views

scale polygon in Qgis [duplicate]

The task is to scale a polygon in QGIS. The procedure is performed tracing the polygon and then apply a scaling factor ( the factor used is " Distance on the ground" / " Distance on map " ) . Both ...
0
votes
0answers
12 views

Aggregate postal code based aggregated data to district scale (MAUP)

I have data aggregated to postal codes for cities in Germany. Is there anyway to aggregate this data to city districts (which look very different from postal codes spatially) in ArcGIS? It is really ...
1
vote
0answers
22 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 ...
0
votes
2answers
46 views

Why 1 cm is 1 km in my map? [closed]

I have this map in ArcMap (you can download my map document from here), and I don't know why, but if I set the scale to 1:1, I can see my whole city. When I used the measure tool, I found out that ...
0
votes
2answers
71 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....
2
votes
1answer
66 views

How can I calculate the canvas scale in QGIS print composer?

Using the atlas functionality in QGIS 2.14 The canvas scale varies according to the object in question (national parks). I want to have a numbered scale based on the canvas print size. I tried using ...
1
vote
2answers
96 views

QGIS 2.14 Essen Scale Setting Problem

The scale of the canvas plot shows in the status bar as everyone knows. However If I want to change the scale it refuses to work properly. This occurs whether I select a scale from the drop-down menu ...
3
votes
2answers
669 views

Silverlight Map with ESRI Imagery

I have a map service which is using data from a local repository, viewed using the ESRI Silverlight API. I am dynamically adding a tiled map service for imagery from ESRI. The map service can be ...
1
vote
1answer
751 views

Geoserver SLD for min-max scale range display

I am new to GeoServer. I am trying to add a scale range to a layer that I am serving as a WMS. I want the layer to only be displayed between 1:30,000 and 1:1,000,000. I am using the max/min scale ...
1
vote
1answer
32 views

ESRI Story Maps | Usage in large-scale maps/plans

If there´s a possibility to adjust the scale of the basemap to plan-like maps. Thing is, that i´ve got a map/plan of a greenhouse and i wanna make a "guide" through this greenhouse to show some rare ...
4
votes
4answers
138 views

How do I create a map that is not to scale in QGIS?

I want to make a map that isn't to scale and I'm so used to being pedantic about CRS and scale that I don't know where to start. The map that I need to make is a simple guide for people to get to a ...
-4
votes
2answers
61 views

Is it possible to find the minimum map-able unit (MMU) after creating a map?

I'm not very good with the GIS lingo so I apologise if this doesn't make too much sense! Lets say I have just finished digitising the land cover of an aerial photograph and it's looking like the ...
0
votes
0answers
53 views

How to scale polygon to obtain specific area in javascript?

I have got a source polygon (saved as standard js array). I want to scale it down to obtain new destination polygon in the centre with 1/3 of source area. On the cartesian space i just scaling down ...
4
votes
3answers
149 views

Layer Extent NOT Set When Bringing In ArcGIS Server map service?

I published a mapping service on ArcGIS Server 10.3, set the layer to 'Don't show layer when zoomed' 'in beyond' to 1:577,791, prior to publishing. When I bring in the mapping service into ArcMap, ...
2
votes
1answer
68 views

Polygon scaling using arcpy

Is it possible to scale each polygon by a numeric value in an attribute table field using arcpy. I have updated the code from some previous excellent work done by Evil Genius import arcpy import ...
0
votes
1answer
56 views

Setting up Hot Key to zoom to Map Scale?

I'm wondering if I can set up a hot key to zoom to 1:4500 whenever I use it. Also if I can set up a hot key to zoom in to 1:1250. I have these two extents set up in the custom extent area and when ...
3
votes
1answer
114 views

How to automatically assign current map scale to a shape created in QGIS?

In QGIS, would it be possible to automatically assign the current map scale to a feature created during an edit session and save it into a field in the attribute table? I have a series of OS maps of ...
2
votes
2answers
38 views

Interpolation of point data with different scope

I need to interpolate a raster from point data (air pollution stations data). What I want to achieve is to distinguish the station's scope (or range or scale). For example some station's data are ...
1
vote
1answer
57 views

Printing at scale using MapInfo?

Using MapInfo 12.5, I want to be able to print a property at a set scale - say 1:1000 or 1:5000. What is the easiest way to do it? I want to be able to show a Scale Bar so that the user can ...
0
votes
0answers
43 views

Inserting scale bar in ENVI without resolution loss

I am currently using ENVI version 5.3.1 and am trying to insert a scale bar to the image, in addition to the north arrow already provided by default. I have tried searching on how to do this with most ...
4
votes
2answers
95 views

Map scale based on altitude

I'm either missing something or failing at some basic math here, but is it possible to calculate the map resolution (map units/pixel) based on altitude (from sea level)? I have center coordinates and ...
3
votes
2answers
6k views

Drawing circle of specified radius in meters using ArcGIS API for JavaScript?

I am trying to add a circle of a specified radius (let's say 200 meters) to a map. My thought is to create a SimpleMarkerSymbol object. The constructor asks for a size of the symbol in pixels, but I ...
3
votes
1answer
77 views

Way to Shrink Alaska and Hawaii for “Stereotypical View”

Is there anyway to shrink Alaska and Hawaii to create a map that looks like the stereotypical map with AK in the corner, etc.? I thought about trying to isolate AK and HI in their own layers and then ...
2
votes
0answers
15 views

How to create dynamic (depend on scale) coordinates grid in ArcGIS for Desktop? [duplicate]

I am working in ArcGIS Desktop. I want to dynamicly change my coordinate grid in layout view depending on map's scale. How to do that? Currently I have to change this manually every time I zoom in or ...
1
vote
0answers
19 views

In ArcMap, how much is a Zoom Out click [duplicate]

In ArcMap, when I zoom out (or in) a single mouse-click (not dragging a rectangle, just a click), what is the change to the ratio? If it is different between coordinate systems please explain it on ...
1
vote
1answer
47 views

Calculating scale for printing on paper

I will be making PDFs with maps on them. Two pages, one a4, one a3 format. Both will print the same thing, just one is going to be larger. Question - what scale do I print on the PDF? The number. If ...
1
vote
0answers
72 views

Leaflet.js setBounds, scaling

I'm using leaflet.js to create a map of Scotland, with two insets for the Orkney and Shetland groups of islands. This is as far as I've got. I wish to guarantte that no matter what size the overall ...
51
votes
12answers
102k 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
0
votes
0answers
19 views

Cached services appear at all scales but not limited to the cache scales

Cached services appear at all scales but not limited to the cache scales Can anyone give an explanation why the Cached services appear at all scales but not limited to the cache scales, for example I ...
0
votes
0answers
17 views

Scaling distance by area

For each administrative unit, I calculate the median distance between businesses. However, for larger unit, this distance is naturally bigger (and does not paints a fair picture of, say, the effort by ...
3
votes
2answers
2k views

How do I know the vertical/horizontal units of my DEM? I'm creating a slope using gdaldem

I'm using gdaldem to create a slope map. I can apply a scale. The default is 1. The notes say: Ratio of vertical units to horizontal. If horizontal unit of source DEM is degrees (e.g WGS84 ...