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

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0
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2answers
27 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
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0answers
20 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 ...
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 ...
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 ...
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
76 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
193 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
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 ...
2
votes
1answer
67 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 ...
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 ...
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 ...
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....
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 ...
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
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 ...
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 ...
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 ...
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 ...
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
96 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
1answer
81 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 ...
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 ...
0
votes
1answer
252 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 ...
0
votes
0answers
45 views

Why did the USGS use 1:24,000 scale for their large scale topo maps?

I can't find any particular reason this scale was used for most of their 7.5 minute large scale topo maps. At 1:24000 1"=2000' and 1cm=240m and the area per map varies between 49 and 70 square miles, ...
1
vote
0answers
70 views

QGIS: layer scale visibility

I need to display a line-type layer differently according to scale. Do I necessarily have to use a rule-based representation and make several different rules (one per scale interval) or is it possible ...
0
votes
0answers
73 views

Digitizing scale when digitizing from Bing imagery service in QGIS

I need to digitize a bunch of islands from imagery in QGIS. It is the Bing Maps aerial imagery layer. I will obtain all required permissions. My plan is to lock the map scale at 1:25,000 and use heads ...
0
votes
0answers
90 views

OpenLayers Layer.Vector with external graphic image overlay - scale help

I have this image overlay that has a lot of dynamic features associated with it, which are coming from a JSON file that's updated regularly with live data. I believe I need to use the Layer.Vector ...
1
vote
1answer
99 views

Merging two polygon layers with one layer having priority over the other

How do I merge two polygon layers? One is coarse scale over a large area (land use). The other is fine scale but is patchy (agricultural fields) in extent. I want the same extent of the land use layer ...
0
votes
0answers
13 views

different zoom level for same shapefile arcmap [duplicate]

I have a road Shapefile in ArcMap which includes three different type of roads highway, motorway, streets. I want to display all these roads at different scale. One way to do this is to create three ...
1
vote
0answers
57 views

Scale Selection Symbols with Reference Scale using ArcGIS Engine?

With an ArcGIS Engine application, I am trying to figure out how to have the Selected Symbols scale with reference scale when selected using ArcObjects. They are currently not scaling correctly in ...
0
votes
0answers
20 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 ...
1
vote
1answer
102 views

Digitized Map To Scale

Is it perfectly acceptable to produce a map at a scale of 1:24,000 from a database that was digitized from a 1:100,000 scale source map?
0
votes
1answer
21 views

Scale and density values in density map appear wrong when in projected coordinate system?

I'm making a series of maps illustrating different aspects (road density, location of dams, elevation etc...) of a single watershed in California. In most of my maps, I've had the projection set to ...
4
votes
1answer
253 views

Is there a way to change the scale bar interval and other settings on individual Data-Driven Pages?

Sometimes I'll have a MXD set up as a mapbook using Data Driven Pages, but I'd like to display certain pages at a different scale than others in the same mapbook. I can do that using the Data Driven ...
0
votes
0answers
21 views

ETRS89-LCC true scale

With QGis 2.12.0 I made a map with the "EPSG 3034 ETRS89-LCC" I then modified the parallels of latitude with custom ones by the rule of 2:6, so from: +proj=lcc +lat_1=35 +lat_2=65 +lat_0=52 +lon_0=10 ...
1
vote
0answers
27 views

QGIS Data Frame scale

I am trying to setup the Data Frame in QGIS to a minimum scale of 1:0 like ArcMap does. Zooming in goes down to 25.000:1 Any suggestions? Thanks
0
votes
0answers
17 views

How to create a coverage layer (low overlap & fix scale)

I'm preparing a coverage layer from a linear SHP ( a pipe of 300 km). I use the tool "v.split.length" to cut the original SHP into several sections. In the box "maximum segment length" I manually ...
1
vote
0answers
14 views

Features becomes bigger on zooming in Openlayers 2.13

i'm new in developing Openlayers applications.I want to add Points and LinearRing objects to the same layer. My Problem is, when I add a LinearRing and I am zomming in, the geometry gets bigger and ...
1
vote
1answer
53 views

stack 10 modis ndvi geotiffs and scale them by 0.0001

I have 10 geotiffs Modis ndvi named 2005.tif ... 2014.tif I want to stack them all and create timeseries. i know how to do that, but the stacked images still need scaling by 0.0001. how can i bulk ...
0
votes
1answer
46 views

Frames from CAD to frames in Qgis

I'm trying to use some frames from Autocad (DXF / DWG) as a frame in Qgis (*.qpt??) but I don't know how to do it or if it's possible.
1
vote
0answers
48 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. ...