Image Mosaics

OGC WMS via GeoServer

Presentation by Jonathan Meyer
Applied Information Sciences

November 12, 2015

Agenda

Motivation
Dataset
Standards
Software
Automation
Demo
Review
Links

Motivation

Provide single point of access to thousands of images individually or as composite mosaic.

Dataset

Suomi National Polar-orbiting Partnership (NPP) satellite VIIRS sensor Day / Night Band collections.

Standards

Open Geospatial Consortium (OGC) Web Map Service (WMS) complaint HTTP service.

Software

Leveraging a fully FOSS stack:

PostgreSQL / PostGIS
GeoServer
OGC Preview

Automation

Your time is valuable. Don't repeat yourself. Use:

GeoServer REST API
Docker
Scripting (Python/BASH/Perl *gasp*)

Demo

Stack Initialization
Image Mosaic Configuration
WMS Query Examples
REST API Seeding and Manipulation
OGC Preview Visualization

Stack Initialization


docker-compose build

docker-compose up -d

bash initial-viirs-dnb.sh

Image Mosaic Configuration

indexer.properties


TimeAttribute=collect_time
Schema=*the_geom:Polygon,location:String,collect_time:java.util.Date
PropertyCollectors=TimestampFileNameExtractorSPI[timeregex](collect_time)
Caching=false
AbsolutePath=true
Name=viirs_dnb

timeregex.properties


regex=[0-9]{8}_[0-9]{6},format=yyyyMMdd_HHmmss

fileregex.properties


regex=.*

WMS Query Examples

Last 24 hours of data (relative to server time):


/geoserver/wms/reflect?
layers=mosaic:viirs-dnb&time=p1d/present

Only data for the 10th:


/geoserver/wms/reflect?
layers=mosaic:viirs-dnb&time=2015-11-10/2015-11-11

Mosaic REST API

List images in mosaic:


/geoserver/rest/workspaces/mosaic/coveragestores/viirs-dnb/
coverages/viirs-dnb/index/granules.json [GET]

Delete image by name from mosaic:


/geoserver/rest/workspaces/mosaic/coveragestores/viirs-dnb/
coverages/viirs-dnb/index/granules.json?filter=file_name=
'npp_viirs_adaptive_dnb_20151111_230621_wgs84_fit' [DELETE]

Add image by system path to mosaic:


/geoserver/rest/workspaces/mosaic/coveragestores/
viirs-dnb/external.imagemosaic
[POST with file system URL as body]