Surveying, Mapping and GIS

Exploring all aspects of mapping and geography, from field data collection, to mapping and analysis, to integration, applications development and enterprise architecture...

  • Geospatial Technology, End to End...

    Exploring all aspects of mapping and geography, from field data collection, to mapping and analysis, to integration, applications development, enterprise architecture and policy
Showing posts with label land use. Show all posts
Showing posts with label land use. Show all posts

US Streets

Posted by Dave Smith On 5/11/2008 06:53:00 PM 2 comments

This is an interesting view of the United States:

- found on Ben Fry's website, http://benfry.com/allstreets/index.html

The author compiled all local roads, and visual patterns of density and human use rapidly emerge. Here, a mix of physical barriers (such as valleys within the Appalachians) can be seen along with major corridors of development. There are still some blocks within some states which are not fully populated (shown as generally-rectangular, lighter-density areas in some of the midwest states), Fry ascribes this to differences in how roads are characterized and classified.

Treasured Maps of New York City

Posted by Dave Smith On 1/14/2008 12:41:00 PM 0 comments

The New York Post has an article today, titled "Treasured Maps" - highlighting the work of Scott Stringer, who is charged with preserving historic maps of New York City - among them, the Randel Farm map, which laid out the grid of Manhattan Island from Houston to 155th St.

These historic maps show many features of streams, wetlands, lakes and other things which have since been reshaped through development - a timeline of the good, bad, and the ugly contained in a map repository going back to 1748.

The world needs more Scott Stringers - he is steward for New York County's maps - I unfortunately hear periodically of plenty of other instances where maps lie crumbling, for lack of proper preservation.

Sustainable Zoning and Development

Posted by Dave Smith On 1/06/2008 04:22:00 PM 0 comments

Jeff Thurston at Vector One has another great post speaking to one of his passions - sustainability.

He touches on the issues of infrastructure and zoning - and here, I wholly agree, we need to rethink our approaches to land use and infrastructure.

In antiquity, our approaches were geared toward communities, where people were able to work, live, buy, sell, trade, interact, worship, and essentially conduct all the activities they needed on convenient terms - typically one could traverse a small town on foot with ease, finding grocers, butchers, bakers, and any other needs handy. With the introduction of factories and mass production, along with mass transit, such as trolleys and buses, manufacturing and heavy industry was able to make an upsurge.

With the automobile, our definition of "convenience" began to shift, and our towns and cities became increasingly pedestrian-unfriendly. Add to this, the increasing pressures and consequences of the heavy industry and other uses which were less compatible with residential use, which ultimately led to segregation of land uses.

Ultimately, folks escaped from the cities, only to bring the cities with them, in the form of row after row of identical, cookie-cutter subdivision homes, spread over mile after mile of what had once been prime farmland.

Consequently, the pendulum has swung, from small, intimate community, to the scattered, impersonal, suburban sprawl of today. Perhaps the time has come for the pendulum to swing back - we have seen the rise of gasoline costs, and along with it, an increase in telecommuting and infrastructure alternatives.

The economic and cultural drivers are in place, however the regulatory and governance aspect still lags behind - with reforms to zoning and land use planning needed, along with different models for dealing with infrastructure relating to the "convenience factor"... Here is a place where I anticipate GIS having a definite and distinct role in demonstrating the cases and scenarios for future land use and development paradigms - and along with it, principles of land conservation and open space preservation.

Resources:


Cameroon GIS Data - and the benefits of technology

Posted by Dave Smith On 3/18/2007 11:12:00 AM 1 comments

I have gotten a few good responses regarding Cameroon GIS data for the Engineers Without Borders project thus far. Things like this make me consider how fortunate we are -

Here in the US, there are quite a few excellent datasets, rich with attributes, and with excellent positional accuracy.

Satellite technology and other approaches have made it much easier to get data for rural areas and those without the economic support for GIS that we enjoy here.

I can't imagine getting this far, this quickly trying to do any of this 10 or 15 years ago...

So far, I have obtained SRTM tiles with elevation data and quite a few other datasets, for protected areas, land use/land cover and other information... This is starting to come together. But please keep the suggestions and data coming...

In Search of Cameroon GIS Data

Posted by Dave Smith On 3/16/2007 08:50:00 PM 1 comments


I am currently working with Engineers Without Borders to look at a project in Cameroon, to provide a rural village with a viable potable water supply. To this end, I am looking for any pointers toward GIS data, aerial photos, elevation data, imagery and anything else of value in engineering design and environmental science that would help in design of water distribution, water conveyance via pipeline, wastewater treatment and the like. I'd like to be able to evaluate the big picture, with regard to potential opportunities and constraints to engineering design, ahead of a site visit to take place later in the year.

If you have access to data or good knowledge of GIS data in the region, Please contact me offline at dsmith (at) synergist-tech.com.


Just received this announcement from a colleague:



National Land Cover Database (NLCD 2001)
The U.S. Geological Survey, on behalf of the interagency Multi-Resolution Land Characteristics Consortium (MRLC), is pleased to announce the availability of NLCD 2001 products for the conterminous United States. These products are web enabled for download from the MRLC website at www.mrlc.gov. NLCD 2001 products include 21 classes of land cover, percent tree canopy and percent urban imperviousness at 30 m resolution derived from Landsat imagery. NLCD 2001 will support a wide variety of users, institutional sectors and local- to national-scale applications with this updated land-cover data. Alaska, Hawaii, and Puerto Rico will be completed by December of 2007, which will then represent the first compilation of nationwide land cover ever produced at 30-meter resolution.


Great news for a wide variety of applications - I was just looking at a watershed application, myself, where this data will fit quite nicely.

I did a quick check, it's not yet visible in the MRLC map viewer, however the data is available via FTP - visit the Multi-Resolution Land Characteristics site: http://www.mrlc.gov/




Technorati tags:
, , , , , , , , , , , , , , , , , , , , , , , , ,

Search