Category Archives: NPS Workflow

Converting GeoPDFs with GDAL

On September 10, 2015, Posted by , In NPS Workflow, By , With No Comments

GDAL, or the Geospatial Data Abstraction Library is a set of tools that can be used to both read and write information into geospatial raster data formats. This is an open-source tool released under the Open Source Geospatial Foundation license. This software can be used as an alternative to programs such as Global Mapper and…

Collarless Top Maps from USDA Geospatial Data Gateway

On September 10, 2015, Posted by , In NPS Workflow, By , , With No Comments

The USDA Geospatial Data Gateway can be used to download pre-processed collarless topographic maps in MrSid format. These will be compressed county mosaics. Quality varies from county to county, and these products may be of slightly poorer quality (resolution) than the USGS GeoPDF files. However, this method provides a greatly…

Using LAS Datasets to Create Functional Outputs

On September 10, 2015, Posted by , In Lidar,NPS Workflow, With Comments Off on Using LAS Datasets to Create Functional Outputs

Now that we know where to download elevation data (see blog post titled “Obtaining Elevation Data from NOAA Digital Coast”), we can use these data for creating useful outputs and beautiful visual aids. This blog post will discuss how to easily create a LAS dataset, and then how to produce…

Mosaic Datasets and LiDAR Data: Advanced Processing

On September 10, 2015, Posted by , In Lidar,NPS Workflow, With Comments Off on Mosaic Datasets and LiDAR Data: Advanced Processing

This blog post builds on the techniques discussed in the “Mosaic Datasets and LiDAR Data: An Introduction” blog post. Here we go more in-depth and further explore the functionality that mosaic datasets offer LiDAR data. First, we will create a “Surface with Features” mosaic dataset, then we will create a…

Part 3: Create a Pansharpened Image Using ArcGIS

On September 10, 2015, Posted by , In ArcMap,NPS Workflow, By , With Comments Off on Part 3: Create a Pansharpened Image Using ArcGIS

Panchromatic sharpening, more commonly called pansharpening, is a process in which two raster datasets are fused together to create one high-resolution, easy to analyze raster dataset. This process utilizes one high-resolution panchromatic image and one lower-resolution multiband color image. By combining these two images, the final product not only has…

Part 2: Creating a Multispectral Mosaic Dataset

On September 10, 2015, Posted by , In ArcMap,NPS Workflow, With Comments Off on Part 2: Creating a Multispectral Mosaic Dataset

Quickbird is a high-resolution commercially-owned (DigitalGlobe) “earth-orbiting” satellite that is used to collect high-accuracy imagery; this imagery is available in both panchromatic (black and white) and multispectral (a wide range of frequencies across the electromagnetic spectrum). While the data used in this example is unavailable for testing, some sample Quickbird…

Part 1: Creating a Panchromatic Mosaic Dataset

On September 10, 2015, Posted by , In ArcMap,NPS Workflow, With Comments Off on Part 1: Creating a Panchromatic Mosaic Dataset

Quickbird is a high-resolution commercially-owned (DigitalGlobe) “earth-orbiting” satellite that is used to collect high-accuracy imagery; this imagery is available in both panchromatic (black and white) and multispectral (a wide range of frequencies across the electromagnetic spectrum). While the data used in this example is unavailable for testing, some sample Quickbird…

Creating a Mosaic Dataset from Orthophotos

On September 10, 2015, Posted by , In ArcMap,NPS Workflow, With No Comments

Now that you’ve downloaded imagery from the Hurricane SANDY Response Imagery Viewer, you’re ready to start creating a mosaic dataset with the imagery (if you haven’t downloaded imagery yet, please refer to the last blog posting titled “Utilizing NOAA’s Hurricane Sandy Response Imagery Viewer”). A mosaic dataset is a powerful way to store,…

Downloading USGS Topo Maps from the National Map Viewer

On September 10, 2015, Posted by , In ArcGIS Online,NPS Workflow, By , With No Comments

This short tutorial will detail how to download current topographic maps for an area of interest from the National Map Viewer. This is a platform where the most recent topographic products can be downloaded free of charge. Download the most recent USGS GeoPDFs for an area of interest at: http://viewer.nationalmap.gov/viewer/ Zoom…

VDatum to Convert LAS Data into MHW Vertical Datum

On January 20, 2015, Posted by , In Lidar,NPS Workflow, With No Comments

Written by: Anthony Campbell (Graduate Student) The need to convert the vertical datum of data is a problem particularly prevalent in coastal applications. For example bathymetric data is often in one vertical datum and terrestrial elevations in another. You open the data in ArcGIS hoping on the fly projection takes…