cgmi / complex-log-projection

Showcase for complex logarithm projections.

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Complex Log Projection

This repo implements a showcase for complex logarithmic views for geo polygons. The actual projection is implemented in another repository: https://github.com/biosmanager/d3-geo-polygon/

The idea is based on the following papers:

• Detail‐In‐Context Visualization for Satellite Imagery
• Complex Logarithmic Views for Small Details in Large Contexts

Usage

1. Clone this repository with its submodules

   git clone --recurse-submodules https://github.com/cgmi/complex-log-projection.git

2. Install yarn

3. Install all dependencies of the project

   yarn install

4. Start the dev server by

   yarn dev

   or run production by

   yarn build

   You can use --public-url <path> to specify the public URL to serve on. See Parcel CLI for more information and the yarn scripts below. Use yarn build-local to build a production bundle that can be used locally without a webserver.

5. Navigate your browser to localhost:1234

yarn scripts

Usage: yarn run <script> or yarn <script>

Script	Description
dev	Starts development server
build	Builds for production, public URL: /
build-local	Builds for production, runs locally without a webserver, public URL: ./
build-github	Builds for production and deployment as a GitHub page, public URL: /complex-log-projection/
deploy	Deploys the current build from build/github to the live GitHub page
test	Runs all tests

Visual Studio Code specifics

This repository comes with a launch configuration for VS Code to debug using the Google Chrome debugger.

complex-log-projection's Issues

Canvas renderer for better performance

Show current projection center and allow manual values

Some rotations lead to overlapping polygons (complex log)

Clipping polygon does not always correctly cut off the geometry at the 180°/-180° line in the complex logarithm projection.

Path generator produces some NaN values (complex log)

There are no visual impairments but it could lead to other problems along the way

Scale affects translation of complex log