# What is *tabula*?
Tabula is a GIS (geographic information system) web application used to project continuous data (called indicators) onto a geographical region. Currently it only supports Portugal's mainland and archipelagos.
## What does it do, really?
As an example, the following cartographic map was obtained feeding into *tabula* public data from [Instituto Nacional de Estatistica](https://www.ine.pt/). It depicts purchases using points of sale (€) by geographic localization (data pertains the year of 2017).
### Data segmentation and projection
Tabula allows you to define the number of intervals you wish to segment your data; by default it projects the values by [quantiles](https://en.wikipedia.org/wiki/Quantile), but you can set up your own intervals.
### Geographic region
You can select only an area of interest for the cartographic map.
### Color scales
Tabula provides 11 different color scales, some of which are appropriate for colorblind people.
### Interactive maps
You can also use the *explorare* feature, which projects the data onto an interactive map:
You can see live screenshots [here](http://tabula.brunomnsilva.com/screenshots/).
## Can I try it out?
Sure! Just follow [this link]( https://brunomnsilva.shinyapps.io/tabula/) and use the following credentials:
* Username: demo
* Password: demo
Be aware that the demo version only allows the generation of *png* images with a watermark.
## How can I use it?
It depends on how you intend to use it.
### For academic purposes
If you intend to use it solely for academic purposes, contact me and I'll set up your own credentials for the *full* version, i.e., generates *png* and *pdf* cartographic maps without any watermarks. Please note that the *academic* version is hosted on *shinyapps.io* and it's subject to processing caps. I cannot guarantee its availability.
Contact must be made throught your institution's personal email address.
However, you **must** provide attribution to the *tabula* application, including the app's webpage address.
#### Attribution example
**Cartographic maps generated with *tabula* - http://tabula.brunomnsilva.com**
### For comercial purposes
If you intend to use it for creating cartographic maps with the intent of publishing and/or distributing them, related to any comercial purpose, please contact me.
You can contact me at: brunomnsilva@... (google mail account)