Introduction
Mapviewer is an abstraction over Leaflet that can create common GIS applications using configurations.
{% from mapviewer_app import load_page %} {% raw load_page('mv-about.html') %} {% raw load_page('mv-getting-started.html') %}Options
Mapviewer
options are listed at g1 docs.
Features
Mapviewer
currently supports markers, circle markers, choropleth, drilldown abilities.
How-to
{% raw load_page('mv-controls.html') %} {% raw load_page('mv-colors.html') %} {% raw load_page('mv-click-events.html') %} {% raw load_page('mv-tooltip.html') %}Resources and Tutorials
Resources
Mapshaper
Use mapshaper to view, edit, compress, export map files. It accepts multiple file types and exports toGeoJSON
, TopoJSON
.
It also has an excellent command-line utility support.
QGIS
QGIS is a powerful cross platform software allows viewing, editing of shapefiles with layer-level control. It has support to export the shapefiles to GeoJSON in custom coordinates.Leaflet
leafletjs is a JavaScript library to render maps on web interfaces.Tutorials
Video introduction
Here's a detailed introduction to Mapviewer, its background and possibilities.
Shapefiles can get large in size due to different reasons:
original GeoJSON
could be of high quality, GeoJSON
layer could have
several attributes which might not be used in your application.
How to optimize your mapfile with mapshaper
Often your application might not need a detailed view of the map. Simplifying the boundaries of the map will still retain geographic boundaries without distortion. Mapshaper allows us to simplify maps to great extent using different algorithms.
{% raw load_page('reduce-mapfile-size.html') %}Filter attributes in map file in mapshaper
Depending on the source of your GeoJSON
or TopoJSON
file,
it can contain several data attributes. Your application might not need all attributes.
Mapshaper gives the ability to do this on the browser but via commands.
Create a custom region map file in QGIS
India map at state level, district level, block level are commonly used. If you were to use a custom region map, say division level. How would one go about creating such map? At an abstract level, state contains divisions, each division contains districts, each district contains blocks and each block contains villages.
{% raw load_page('custom-map-file.html') %}