The study and practice of making maps.
1
vote
1answer
15 views
Get QgsLayoutItemMap from existing QPT Layout
I created a QPT model with a map inside QGIS. The problem is when I try to select the map under pyQGIS :
qpt = QDomDocument()
qpt.setContent(content)
layout = QgsLayout(QgsProject().instance())
...
0
votes
1answer
50 views
Creating climate maps in QGIS? [closed]
I have millions of points having temperature and humidity information covering the Middle East and North Africa (MENA).
How can I create animated heatmaps/hotspot maps of change over time? The data ...
0
votes
1answer
11 views
CARTO Mobile SDK.UWP (C#) Get always get current map's south-west MapPos and north-east MapPos
How can I always get the current map's south-west MapPos and north-east MapPos when I zoom in/zoom out the map or drag the map? I want to create a dynamic bounding box for Carto Map.
1
vote
0answers
18 views
Create a path in mapping software and export as vector?
Is it possible to map a route in any mapping software (OpenStreetMaps, Google Maps/Earth, QGIS, etc. preferably Open Source or free) and export this route as a vector (PDF, AI, SVG etc.)?
I'm only ...
0
votes
0answers
20 views
“Story/Web map” that allows user to select features and get a summary of attributes
Is there a way to create an interactive app/web map/story map that allows the users to select a combination of polygons and get a summary of their attributes, esp. their total area, in a table or pop-...
0
votes
0answers
36 views
Amplitude map from text data
Is it possible to create amplitude map in QGIS with data in text? Or rather it is in .dat. I have three columns: longitude, latitude and sea level (like -1, 3). I imported points using delimited text ...
2
votes
0answers
68 views
Map Projection invented by woman
Is there any map projection of the earth that has been invented by a woman?
Context: I am starting a math outreach program and one of the activities I am proposing involves playing with different ...
0
votes
0answers
10 views
How can set “wait time” in CZML?
I have some position & time values describing movement of some vehicle. But in some time intervals vehicle wait in some position. I cant figure out how can i set waiting time.?
In the example ...
1
vote
0answers
38 views
MapBox GL JS - Markers or Layers
Ok. I've a server which send me a geojson data, according to the specifications. I'm using mapbox gl js, and not sure what type of method to choose: 1) creating a layer with geojson properties of ...
4
votes
1answer
53 views
Can QGIS produce a Stage Storage Plan?
I work for an engineering firm, and my question to the forum is:
Can QGIS produce a stage storage plan for multiple drainage basins? I am attaching an image of what I am talking about.
Currently, we ...
0
votes
1answer
85 views
portrait orientation in layout of qgis.3.2.0(bonn) [duplicate]
How to set a map in portrait orientation in layout of qgis.3.2.0(bonn).there is no option in layout view for changing the orientation of paper.
2
votes
0answers
47 views
Cartographic numbering of points on map
Usually when I create maps with a set of numbered points (e.g. numbered locations on the map which link across to a separate table describing these points) I try to number them in a rough "reading ...
1
vote
0answers
32 views
PostGIS generate lanes for multilinestring map (ST_OffsetCurve)
I currently have a road network for specific area as multilinestrings. It only shows the road as a single line. I would like to generate lanes for that as well, using some kind of offset. The problem ...
4
votes
1answer
87 views
Mapping parliamentary results (categorical data) by share of polygon in QGIS
I'm trying to recreate the fill effect in this map: Where each polygon is filled based on the percentage of vote each parliamentary party gained. The author wrote "I converted the inner polygons into ...
0
votes
0answers
35 views
Is there a way of getting map subsections referenced on main map in qgis? [duplicate]
Is there any way of getting subsections of a map as in, you have a larger map area in which you want to take out 3 smaller areas (A, B and C), you reference them on the "main map"
Currently I have ...
5
votes
2answers
81 views
How much of these USGS topographical contour maps are artistic license?
I was looking at the below map and got to wondering how much of all of those minute squiggling contour lines are real detail and how many are just artistic flair:
I could imagine that satellite laser/...
1
vote
1answer
88 views
Drawing point not under mouse cursor
I'm trying to draw on a map using this OpenLayer tutorial.
initDrawEvent() {
var draw;
var source = new VectorSource({ wrapX: false });
var vector = new VectorLayer({
source: source
});
...
4
votes
1answer
114 views
Making a transparent globe in ArcGIS Pro
In ArcGIS Pro (2.1), I'm attempting to create a 3D scene in which the underlying basemap is transparent such that I can see through the oceans.
I'm trying to get an effect similar to this.
Or this:
...
1
vote
1answer
120 views
How to offset lines in QGIS that share the same origin and destination
I have a set of lines in QGIS that represent travel between destinations.
Some of these lines of travel overlap - for example, traveling from Rome to Paris, and then back to Rome, and then on to ...
1
vote
0answers
106 views
Weird lines on google maps [closed]
While I was travelling with my GPS "ON" and tracking my route I found this strange lines in pink and green dotted lines when I zoomed out the map I found that the lines where coinciding with the ...
1
vote
0answers
132 views
Georeference map with just one known point
I have an old scanned topographic map I have to georeference. Unfortunately there is no coordinate system stated and it has just on reference grid point on it. Besides that it states in the down left ...
0
votes
0answers
39 views
Sweeping across a map: how to calculate lat lon
I am trying to retrieve information which is displayed overlaid on Google Maps.
I can get a JSON response with coordinates for the points I'm interested it. The API to get the JSON response expects a ...
1
vote
2answers
127 views
Why North direction is shown in red color on aspect maps?
I have been recently exposed to an aspect map that looked like this:
I wonder why North-y orientations (N, NE, NW) are shown in red and orange while South-y orientations (S, SE, SW) are shown in ...
0
votes
1answer
37 views
What CRS is used in historical maps on IEG-MAPS
Do anyone know what coordinate reference system is used in set of historical maps of Europe from Leibniz Institute of European History
Below sample map from set
0
votes
0answers
124 views
Custom regions plotting in highcharter/leaflet in R
I need to plot the following regions (Western USA, Eastern USA, Africa,
APAC (excl. China),Canada,LAC,Europe,Greater China,Middle East) in a map in R (highcharter or leaflet). Currently I don't have a ...
0
votes
2answers
143 views
QGIS and Google map doesn't match/lineup!
I am trying to draw a map but in QGIS the map doesn't correctly show one of my study area (Station-4) correctly; however, the Google Map does.
What should I do now to get a correct map (Station-4) ...
1
vote
2answers
51 views
Where do map services get their town name data from? [closed]
Looking at several map services, they all contain the names of basically every place where several humans live.
Cities and towns are quite easy to find, but they all contain townships/parishes/...
1
vote
1answer
45 views
What is correct term for map with shaded country outlines?
Many world maps, especially old ones, often have shaded country outlines in a particular color. The saturation becomes weaker towards the inside of the country and is strongest at its borders. Here is ...
0
votes
2answers
42 views
Proper labeling when multiple maps on one sheet of paper [closed]
Suppose I want to display 4 maps on one sheet of paper, all with the same scale and same direction for North. Assume they all have the same projection and datum.
Is it customary to place a unique ...
0
votes
1answer
580 views
Add GML Layer in OpenLayers 4
I'm using OpenLayers 4 to build a web map. Now I'm trying to add a GML layer to the map but only one feature of the layer/GML is painted in the map. So I don't know what could be wrong.
The way I am ...
1
vote
0answers
34 views
Complete map of Oceania (physical, from satellite,…) to use as background [duplicate]
I need to use a map to show a cartographic output based on raster elaborations. Specifically, I want to use this map as background to overlay over it some cells of my rasters layers.
The type of map ...
1
vote
1answer
165 views
R - cartography package - position of legend?
I'm using the cartography package in R to plot a choropleth map. However, I have a problem placing the legend, which can be placed by means of the legend.pos argument, but which always overlaps with ...
3
votes
1answer
189 views
Mapping several maps with the same colorscheme in tmap
How to control the dot colors in tmap? I have the following code:
png(filename = "test.png",
width = 210, height = 297, units = "mm", pointsize = 1,
bg = "white", res = 1200)
for (j in 2012:...
2
votes
0answers
61 views
producing smooth iso polygons from raster surface? [closed]
The objective is to turn a raster surface (double value type) into smooth, visually appealing polygons representing iso-levels. I cannot stress enough that these must be visually attractive. Jaggedy ...
4
votes
1answer
232 views
Automatic bus route map without overlaps
I'm working with drawing maps of all bus routes in a defined area (municipality) in QGIS. I have a problem about showing two routes with the geometry (the same road) parallel. I know it's possible to ...
2
votes
1answer
113 views
D3 Projection outputs Map wrong
I made a map with qgis. Unfortunately when I want to render the map with d3 map renderer, it shows weird structures. The map is in "1:116'622'714" scale. Could this be a problem?
The website should ...
5
votes
2answers
149 views
Unfolding polygons and other feature classes in Antarctica-like fashion using ArcGIS Desktop?
Is there a way in ArcGIS Desktop 10.4 to 'unfold' (reshape/modify) feature classes, e.g. a polygon of a circular city, to make them look similar to a Mercator or plate carrée projection of Antarctica, ...
2
votes
1answer
39 views
Displaying multiple quantitative variables without clutter? [closed]
I am working with a set of data which represents total persons at different pay levels. There are 4 different pay grades which ideally would all be displayed on the same map.
I am new to ArcGIS and ...
1
vote
1answer
115 views
How to find map tiles' parent tiles?
I am wondering how to find the parent map tiles of a particular tile or the tiles contained within a particular map tile. I know tiles usually have the structure of somedir/{z}/{x}/{y}.png/jpg and I ...
1
vote
1answer
61 views
What does “faceting” mean in a geo/map context?
I saw some folks talking about "faceting" in relation to a map data display, what does this mean in general terms? Examples?
0
votes
1answer
30 views
Overview map size related to the main map rule
My question is as simple as it's title implies.
I have a map scaled in 1:20.000 and print it in a A0 paper.
Also, I want to add an overview map in it.
I wanted to ask if there is any rule regarding ...
0
votes
0answers
73 views
Finding zoom level of map downloaded from Universal Maps Downloader?
I have downloaded a map from Universal Maps Downloader. When you use one of its tool called "Map Viewer", you see a map that you can only use 'pan' to navigate on it and its zoom level is fixed.
I ...
6
votes
1answer
88 views
How to keep polygons detailed when exporting in QGIS?
When i export to pdf from QGIS the polygons become rounded or bloated. This image is a printscreen from the workspace in QGIS:
This image is a printscreen from the pdf (size A3 zoomed in 800%):
...
0
votes
2answers
220 views
How do I make a slippy map with a GeoTiff?
It seems that most applications I use for serving map data, gdal2tiles or Geoserver takes the supplied GeoTiffs and chops it up into png files with no metadata. What is the standard practice to place ...
2
votes
0answers
74 views
Projection for a map covering 2 UTM zones [closed]
I know similar questions have been asked about this already, but I would like to check something specifically... I have a copy of a published 1:1m map of Ivory Coast which states (in the legend) that ...
1
vote
2answers
104 views
Software to easily go CSV - map - CSV for editing
I am looking for a piece of software that will easily let me display lat long points from a CSV file on a map, then be able to select a group of points (via a box or drawing), delete the points and ...
2
votes
0answers
144 views
Uniform distribution of dots on world map depending on latitude
I would like to plot a map looking something like this:
I'd like to then connect each dot with the corresponding country and use it to display statistics. Therefore I need a set of coordinates, ...
1
vote
0answers
80 views
What is the style of mapping used by Google Traffic?
I'm doing a piece of work that involves mapping traffic flow, and will be displaying it in a way that Google Traffic does. I know how to make the maps using QGIS, but is there a specific name for this ...
0
votes
0answers
25 views
Unsupervised image classification
What does iteration (initial and successive) in Unsupervised image classification mean? I get that iteration is repetition of the process but I find it hard to figure out what is actually happening in ...
15
votes
1answer
762 views
Examples of cartographic 'jokes'
In the July 2017 edition of Swiss Review, a publication for Swiss living abroad, the cover feature was on Swiss Cartography.
With my interest in GIS this obviously sent me straight to the article.
...
