stacterm

This library is for displaying information (tables, calendars, plots, histograms) about STAC Items in the terminal. It takes as input a STAC ItemCollection (a GeoJSON FeatureCollection of STAC Items), either by specifying a filename or by piping output from another program.

Installation

Install from PyPi:

❯ pip install stacterm

PySTAC and Pandas are required, along with two dependencies for rendering tables (termtables) and plots (plotext) in the terminal.

Usage

stacterm main usage is as a CLI progam stacterm. Use help to see options available:

❯ stacterm -h
usage: stacterm [-h] {table,cal,hist,plot} ...

Terminal STAC

positional arguments:
  {table,cal,hist,plot}
    table               Output a table
    cal                 Output a calendar
    hist                Output a histogram
    plot                Output a plot

optional arguments:
  -h, --help            show this help message and exit

All of the sub-commands in stacterm can take optional field names. A field name is:

• id: The ID of the Item
• collection: The collection of the Item
• Dates
  • date: The date portion of the Item's datetime field
  • year-month: The year and month of the Item's datetime field
  • year: The year of the Item's datetime field
• Any property

stacterm reads from in stdin allowing other programs to pipe output to it, such as pystac-client.

❯ export STAC_API_URL=https://earth-search.aws.element84.com/v0
❯ stac-client search --intersects aoi.json \
    --datetime 2020-07-01/2020-12-31 \
    -c sentinel-s2-l2a-cogs landsat-8-l1-c1 | stacterm cal --label platform

The detailed usage examples below are all shown using the item collection from a search saved to a file and redirected to stdin.

Tables

Use stacterm to display tabularized data from a saved ItemCollection.

❯ <input.json stacterm table

| id                                       | date       |
|------------------------------------------|------------|
| LC08_L1TP_026079_20201014_20201104_01_T1 | 2020-10-14 |
| LC08_L1TP_026079_20201115_20201210_01_T1 | 2020-11-15 |
| S2A_12JXQ_20201008_0_L1C                 | 2020-10-08 |

By default this is a markdown table (note the terminal will not render Markdown)

The fields displayed can be changed via the --fields keyword, and sorted via the --sort keyword.

❯ <input.json stacterm table \
    --fields date eo:cloud_cover collection \
    --sort eo:cloud_cover

| date       | eo:cloud_cover | collection           |
|------------|----------------|----------------------|
| 2020-10-13 | 0.0            | sentinel-s2-l1c      |
| 2020-10-13 | 0.0            | sentinel-s2-l2a      |
| 2020-10-13 | 0.0            | sentinel-s2-l2a-cogs |
| 2020-10-13 | 0.0            | sentinel-s2-l1c      |

The style of the table can also be changed via the --style keyword, although it will no longer be usable in a Markdown renderer. See termtables styles for list of styles.

❯ <input.json stacterm table \
    --fields id date platform sentinel:grid_square\
    --sort date \
    --style thick

┏━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━┓
┃ id                        ┃ date       ┃ platform    ┃ sentinel:grid_square ┃
┣━━━━━━━━━━━━━━━━━━━━━━━━━━━╋━━━━━━━━━━━━╋━━━━━━━━━━━━━╋━━━━━━━━━━━━━━━━━━━━━━┫
┃ S2B_12JXR_20201003_0_L2A  ┃ 2020-10-03 ┃ sentinel-2b ┃ XR                   ┃
┣━━━━━━━━━━━━━━━━━━━━━━━━━━━╋━━━━━━━━━━━━╋━━━━━━━━━━━━━╋━━━━━━━━━━━━━━━━━━━━━━┫
┃ S2B_12JXQ_20201003_0_L1C  ┃ 2020-10-03 ┃ sentinel-2b ┃ XQ                   ┃
┣━━━━━━━━━━━━━━━━━━━━━━━━━━━╋━━━━━━━━━━━━╋━━━━━━━━━━━━━╋━━━━━━━━━━━━━━━━━━━━━━┫
┃ S2B_12JXQ_20201003_0_L2A  ┃ 2020-10-03 ┃ sentinel-2b ┃ XQ                   ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━┻━━━━━━━━━━━━┻━━━━━━━━━━━━━┻━━━━━━━━━━━━━━━━━━━━━━┛

Calendars

A UNIX-like calendar (see cal) is available to show dates of individual items. By default cal will use the field datetime (the collection datetime) and group Items by their Collection. These can be overridden by the --date_field and --label_field keywords. Note that the specified --date_field needs to be a date field, such as created or updated. --label_field will group and label items by the provided field.

❯ <input.json stacterm cal --date_field created --label_field gsd

Histograms

Histograms can be created for any numeric field and datetime and date (just the date portion of datetime). created and updated may also be specified if available in all Items.

❯ <items.json stacterm hist eo:cloud_cover

Plots

Plots can be created with a single numeric fields, a date field (datetime, date, created, or updated) and a numeric field, or two numeric fields. If a single field it will be plotted against the scene number. The --sort keyword can control how to sort the data if plotting a single field.

❯ <input.json stacterm plot eo:cloud_cover --sort eo:cloud_cover

Markers and Colors

For histograms and plots there are options for changing the marker (symbol) and color of the plot, background, and text. These options all come directly from plotext.

In addition to a marker being able to be any single character, the following names can also be provided for these symbols:

Color names can be provided as follows:

Limitations

Currently any provided field must exist in all STAC Items.

Development

There are a lot more options in the plotext library that could be surfaced here. Additionally, if support for datetimes in histograms and plots is added, stacterm could create temporal histograms, or plot quantities vs date.