Mapping

NYS GIS Clearinghouse posted 2020 aerials from St

NYS GIS Clearinghouse posted 2020 aerials from Oswego, Lewis, Jefferson, St. Lawrence, Franklin, Clinton — Chemung and Steuben – Nassau and Suffolk today. They previously posted Monroe and GLOW counties.

https://orthos.its.ny.gov/ArcGIS/services/wms/Latest/MapServer/WMSServer?

Changelog for QGIS 3.18

Changelog for QGIS 3.18

QGIS 3.18 introduces a host of enhancements and new features, along with a long-awaited feature - Native Point Cloud support in QGIS! Thanks to the efforts of Lutra, North Road, and Hobu, QGIS is now able to import and render point cloud data in various formats by leveraging the Open Source PDAL library. This functionality has been introduced due to the success of a crowd-funding campaign and would not have been possible without the support of the QGIS community and contributors. Thank you to all those involved in realizing this incredible milestone!

As QGIS Desktop 3.18 bids farewell to the DB2 database provider, it introduces support for users of the SAP HANA database system.

How Hillshade worksβ€”Help | ArcGIS for Desktop

How Hillshade worksβ€”Help | ArcGIS for Desktop

The Hillshade tool obtains the hypothetical illumination of a surface by determining illumination values for each cell in a raster. It does this by setting a position for a hypothetical light source and calculating the illumination values of each cell in relation to neighboring cells. It can greatly enhance the visualization of a surface for analysis or graphical display, especially when using transparency.

By default, shadow and light are shades of gray associated with integers from 0 to 255 (increasing from black to white).

Hillshade

Hillshade

Hillshading is a technique used to create a realistic view of terrain by creating a three-dimensional surface from a two-dimensional display of it. Hillshading creates a hypothetical illumination of a surface by setting a position for a light source and calculating an illumination value for each cell based on the cell's relative orientation to the light, or based on the slope and aspect of the cell.

...

Anyone can easily search for ArcGIS servers.

Assume you want to know if St. Louis County Minnesota (County seat is Duluth) has a public-facing ArcGIS server. First, find the county website. Note that the website address includes “stlouiscountymn”. Second, do a Google search on: stlouiscountymn “rest/services”.  Include the quotes in your search.

If this county has a GIS server then you will likely see search hits to various places within the table of contents. Open any table of contents page and then in the upper left corner click on “Home”. You now will see the ‘top’ of the table of contents for this ArcGIS server and the browser address bar will display an address that ends in “/rest/services”.

Of course at the county and city level you could simply call or email the GIS staff and ask. Here is one way to phrase the question: “Do you have a public-facing ArcGIS server and, if so, what  is the rest service endpoint?”

Sometimes you might see two server addresses that appear identical except one of them says “arcgis” and the other says “ArcGIS”. Technically these are different internet addresses and these two servers may or may not contain the same information.

Tip: If you are interested in a topic instead of a state/county/city then try a Google search like this example: “climate change” “rest/services”. Include keywords for your topic and always include rest/services in quotes. Many of the hits that are returned will point you to ArcGIS layers.

Some useful information from Joseph Elfelt’s amazing List of ARC GIS Servers.

I continue to look with much interest in the oft-advertised Northwoods Mapping on Facebook

I continue to look with much interest in the oft-advertised Northwoods Mapping on Facebook. This business makes custom farm, hunting, and property maps, printed and sells them over the internet. All of them pretty much use public, copyright-free data, namely state or federal (NAIP) orthophoto aerial imagery, and USGS 3D elevation program LIDAR bare earth data. I don’t know if they use a commercial ERSI product or the fully-open source QGIS program to make the maps, but there is nothing couldn’t be done with free software.

Their prices are quite reasonable – they might seem high at first glance – but it would actually be hard to undercut if you want to make any money for your time designing, laying out and printing maps. Large-format, full-color printing is expensive for small runs. I know I have printed a few large-scale maps, and the printing can easily set you back $50 or more. Add in the cost of high-quality paper and lamination and it really adds up. For example, the 24″ x 36″ HD Laminated Map that they charge $89 for probably nearly half the cost is printing and lamination. Maybe a little less, especially if you do a lot of business with your printer — but custom print jobs are expensive.

So that leaves you with $45 for everything else. As a small business, there are a lot of costs including taxes, marketing, web hosting, and possibly trying to recover some of your cost of using the computer, internet, and so forth. That ignores benefits or other expenses – they probably rely on a regular job for that. Then figure an hour of labor, and you can figure out the cost. Yes, it’s a job you can do from home, and basically anywhere you have an internet connection. But hardly free, despite the data and software free to use and put together.

It doesn’t take long to make a map with QGIS, especially with using Web Mapping Services, that automatically download the imagery for the scene you need into your QGIS client. But no one map is exactly the same, and while you can save the layout, often it requires fine tweaking to get a quality map out of every scene. Labels often require manual placement, the contrast and saturation of map adjusted for that perfect look. Adjustments to scale, additional data to hand-digitize. Plus time going back and forth with the customer to get them a product they are happy with before it goes to print shop. Probably an hour or more time, to get something that is really good quality, that somebody would pay for. It takes years of knowledge working with maps to build really good quality products.

The more time you can spend working on a map, the higher quality. Often revisions take a lot of time — sometimes the maps I post on the blog aren’t always the best quality, but that’s because they are done quickly and to experiment with new parts of QGIS. But it’s neat that they’re able to make a life in the great wilds of northern Minnesota, in a beautiful small town, the home of the Blue Ox, piecing together map making over the internet, and whatever else they do to sustain their family.

While I have done a handful of mapping projects for pay, I don’t really have a connection with a print shop. Most of my projects are done an as volunteer basis, continuing to learning the ins and outs of the software. Every map I put together is teaching me important skills, and I continue to learn the skills to make better and prettier maps. But I think it’s an interesting business opportunity, and if I learned more about print shops and shipping, along with all the other skills needed to operate a small business, it could offer future possibilities. People have certainly asked if I could provide them with that kind of printed map before — but I just don’t have that kind of connection with a local print or shipping shop.