The article represents the method I have used to generate a stream network in a high altitude region in Kerala. The stream network of Devikulam in Munnar is the selected study area and stream and basin is generated using some tools available in QGIS. I am using SRTM DEM with a 30m resolution clipped to the study area and a set of SAGA tools available.

The steps are as follows:

1. Load the DEM and reproject using the Warp/reprojection tool

The first step is to clip and reproject a DEM into a projected coordinate system. Use the option, Raster > Project > Warp/Reproject

Select the required Projected coordinate system with reference to the study area.

1. Fill Sinks in the reprojected DEM

This step is done to correct any unusual distortions of the DEM and to obtain a continuous hydrological network.

… See full entry

श्री भगवान विद्यालय, बालमटाकळी, तालुका शेवगांव, जिल्हा अहमदनगर. जि.प. प्रा. शाळा, बालमटाकळी, तालुका शेवगांव, जिल्हा अहमदनगर. कर्मवीर एस. एन. हायस्कूल, न्यू बालाजी नगर, औरंगाबाद. Government Polytechnic Aurangabad. Maharashtra College of Engineering, Nilanga Dist. Latur. Swami Ramanand Teerth Marathwada University, Nanded. Maharashtra State Board Of Secondary and Higher Secondary Education, Pune Divisional Board Aurangaabad. अभिनव चित्रशाला, नांदेड। श्री बालंबिका सांस्कृतिक मंडळ बालमटाकळी ता. शेवगाव. महाराष्ट्र राष्ट्रभाषा सभा पुणे। मराठवाडा विज्ञान विकास मंच, औरंगाबाद. श्री शारदा मंदिर कन्या प्रशाला औरंगाबाद. अमानविश्व विद्यालय, औरंगाबाद. मराठवाडा शिक्षण प्रसारक मंडळ. देवगिरी हायस्कूल औरंगाबाद. वेद विज्ञान अनुसंधान संस्था, शिवपुरी अक्कलकोट. महाराणा प्रताप हायस्कूल औरंगाबाद. जगदंबा शिक्षण प्रसारक मंडळ मंठा. सुधाकरराव नाईक हायस्कूल, औरंगाबाद. भ्रष्टाचार विरोधी जन आंदोलन समिती औरंगाबाद. औरंगाबाद जिल्हा यशवंतराव चव्हाण पुण्यतिथी समिती. कर्मवीर श्री शंकरसिंग नाईक हायस्कूल, औरंगाबाद. Directorate of Employment & Self-Employment. Department of Youth Affairs & Sports. Government of India and State Sports Directorates. INDO GERMAN TOOL ROOM, AURANGABAD. The Institution of Engineers (India). ABHINAV VIDYA MANDIR, BHAYANDAR (E), DIST. THANE, MAHARASHTRA. महाराष्ट्र लोकसेवा आयोग. INDIAN ARMY/NAVY, Selection Centre, Bhopal. INDIAN ARMY Selection Centre, Bangalore. कमला नेहरु शिक्षण संस्था, औरंगाबाद. मेहेरसिंग नाईक विद्यालय व कनिष्ठ महाविद्यालय, औरंगाबाद. श्री रंगदास स्वामी शिक्षण विकास मंडळ, आणे.

At HOT’s ‘all staff meeting’ today, we held live finals of the 2021 HOT Staff OSM FIGHT Heavyweight Championship!

For those that don’t know, OSM Fight is a website that allows two OSM mappers to compete against each other based on a number of different metrics.

We had started a few weeks ago with team ‘group stages’ and then entered a knock out competition phase. Only the semi-final and final were left to play…

… See full entry

I’ve been working on a project for a few months now, and keep getting stuck with time out errors from the Overpass API, which I think might be due to the fact that there are so many postboxes and post offices in the world. (Maybe?)

**Background on the project and ideal vision:

I’m helping the guy who runs postcrossing.com (a free website where people from all over can pull an address and send and receive postcards from each other) to build a map where people can easily find the postbox or post office closest to them in order to mail their postcards. This could be especially helpful if people are on holiday or not close to home and are not super aware of the postboxes and post offices in the area. This would be a map that is embedded in a website - there is no app yet for postcrossing.com and does not seem like there will be on in the near future.

I want the postboxes and post offices to be on different layers, so that I can style the icons individually.

The map should be easy to understand and ideally, would also offer the option to edit if need be (i.e add a postbox or post office that does not yet exist on the map, and be able to add opening hours for the post offices and collection times for the postboxes. There would also be the option to add a photo of the postbox or post office.

**Progress thus far:

I began this project using the Overpass API and putting that information into a uMap, which you can find here: http://u.osmfr.org/m/528331/

I set up the cache under remote data to be once a day, but I still get a red error message that says, “problem in the response,” and gets a 429 error in the console when I move about the map.

I first wrote an OSM Diary entry about this project here: osm.org/user/Nicolelaine/diary/396957

Someone suggested that I create a bounding box, following this French tutorial here: https://wiki.cartocite.fr/doku.php?id=umap:10_-_je_valorise_les_donnees_openstreetmap_avec_umap

… See full entry

Introduction

Hi everyone! As GSoC 2021 is coming to a close, I am writing this diary entry as a final report on the progress of my GSoC project, the OpeningHoursEvaluator, in the second period of GSoC.

Previous entries

• Community bonding period
• First period

Project Summary

An evaluator for opening hours tag according to OSM opening hours specification.

Second Period’s Summary

Just to recap, the evaluator from the first period supports almost all the syntaxes defined by the specifications, ranging from something as small as time and a wider range such as year. Building from my previous progress, I have added geocoding to the evaluator, for use in calculation of variable time such as dawn, dusk, sunrise, sunset. I have also added support for holiday data for the corresponding opening hours tag PH and SH, which currently supports 168 countries. Combined with my progress in the first period, the current evaluator now supports evaluation of all the syntax defined by the grammar, and is ready for use in production.

Source code

GitHub repository: https://github.com/goodudetheboy/OpeningHoursEvaluator

Timeline

… See full entry

District Court, Aurangabad, Government Polytechnic Aurangabad, Collector Office Aurangabad, Zila Parishad Aurangabad, Regional Commissioner office, Municipal Corporation, MSEDCL, BSNL Customer Care Centre, BSNL Mobile, HP Gas, Government College of Engineering, CIDCO, HUDCO, MIDC, ASCDCL, Siddharth Garden and Zoo, DTE, ITI, Central Bus Stand, CIDCO Bus stand, City Smart Bus, Railway Station, Airport, Police Commissioner office, High Court, Cannaught place, IT park, Stadium, Theatre, Market, Canteen, police station, post office, CADA, TV Centre, Akashwani, Old Mondha, New Mondha, Bank, ATM, Government Hospital, petrol pump, Ration Distribution Centre, University, College, School, Maharashtra State Board Of Secondary & Higher Secondary Education Pune Divisional Board, RTO

Important Links

Source Code

Nominatim-Feedback-Reporter

Previous Posts

• Community bonding
• Phase-1 Update

Hosted server

• Nominatim-Feedback-Reporter-UI
• nominatim-Feedback-Reporter-API

About the project

This is a Google Summer of Code project, which has been developed over the Summer of 2021 by Yash Srivastava (darkshredder). This project is mentored by Marc Tobias (mtmail) and Sarah Hoffmann (lonvia).

Project Description

OpenStreetMap’s main search engine Nominatim did not provide a way to report feedback on the search results that they think to be wrong.

This project aims to provide a web interface to report such feedback and store them in a logs file. So that the feedback can be analyzed, fixed and can be re-run by the maintainers to see if the problem is still there.

Implementation

The following step was followed to implement this project:

• Selecting the frontend and backend framework for the project.
  • For frontend we used svelte.
  • For backend we used falcon.
• Finding a way to fetch multiple results for reverse geocoding as nominatim only returns a single result.
  • We used overpass API to fetch multiple results and then to provide an option to select a correct result base on reverse search results.
• Hosting the frontend and backend code on the server.
  • Our frontend UI can be found here.
  • Our backend API can be found here.
• Testing the frontend and backend code.
  • We used puppeteer and mocha to add integration tests to the frontend.
  • We used pytest for unit testing backend code.
• Setting up the continuous integration pipeline.
  • We used GitHub Actions to integrate the CI pipeline to test as well as build our frontend and backend code.

Final product at the end of the GSoC

… See full entry

What I did in OpenStreetMap in July 2021

… See full entry

This is a follow-up to a pedrito1414 diary entry on Silvester 2020, which itself, at least from my point of view, was a follow-up to a IRC chat the two of us held on 2020-12-15.

From our chat Pete distilled a short list of nine more or less urgent “issues to address / aspects to improve”. We’re 8 months later and a few days ago I downloaded the online HOT projects summaries, to choose some statistics that might let us measure the process and how it has been improving. Of these 9 points I think that the easiest to measure are #6: “TM projects don’t always get closed out” and #2: “Tasking manager transparency - project creators”.

Let’s start from #6 about non closed projects.

The one thing that HOT is not doing, they are not systematically setting a limit to the projects they host nor directly run: of the 3009 still active projects, 2848 (94%) does not have a due date. for the 587 projects that have been created this year 2021, 460 (78%) does not have a due date. it is a small improvement. limiting this to directly HOT owned projects, it’s a total of 315, of which 297 (94%) do not have a due date. This year it’s 111 projects directly owned by HOT, 94 (85%) of which without due date.

I’ll mention the two top outliers, which did set a due date goal for all their projects: osm-libya (37 projects) and unique-mappers-network-nigeria (5 projects).

Without a due date, it’s easy to let things slip through your fingers, so no surprise there’s still 2 open projects from 2012, 24 from 2013, 27 from 2014, and a total of 1378 unclosed projects published before 2020.

The other issue, #2 about project creators, in my opinion it has to do with local involvement, or lack thereof.

… See full entry

GIS Addict Agriculturalist🙂 Hardworking Scientist Catholic Charismatic Christian🙏

Tried to produce map files for apps like Orux/Locus and such using the mapwriter plugin using an i3 and SSD disk.

Managed to get to zoom 4 before getting yeeted with thread error (or something) after 63 minutes of processing. Ughhh…

With my dear love, Tanya Unger

the idea is to map waste as it transits from source to environment, and work to apply data and public awareness to reverse that trend.

In this blog post we want to count addr:housenumber nodes across all EU member states, broken down by country. That’s a bit above 34 million nodes in total.

Queries are tested on different Overpass instances: two rather busy public ones, one idle private instance and a dev instance. With the exception of the latter, queries run on offical Overpass releases. Database contains a full planet (including metadata and history).

Query: https://overpass-turbo.eu/s/1adO

[out:csv(name, count)];
rel(2668952);rel(r);
map_to_area -> .areas;
foreach.areas->.area (
  node["addr:housenumber"](area.area);
  make data count = count(nodes),
            name = area.set(t["name"]);
  out;
);

Result: https://gist.github.com/mmd-osm/5219028c9fa93db17ac7c271a99183a1

Runtimes

kumi.systems:     gateway timeout after 1h
overpass-api.de:  gateway timeout after 2h
private server:   timeout after >2h
dev branch:       30s

NB: dev branch is exploring alternative implementation options and is currently not released.

Well, today I checked in my first JOSM edits.

First was a boo boo. I cheated and used iD to revert… hah.

Second was what I intended as the first checkin - found out that iD was deliberately nerfed to not allow the edit I wanted to do. Still haven’t figured out the best way but oh boy, JOSM was much easier to move a node 10 miles away. Did a few in iD and that was really no fun.

Then a few more edits in JOSM… just to not get annoyed when iD nags “You didn’t fix the warning I flagged.”

“But I didn’t make the warning… and I don’t know enough to actually fix the warning!”

grumble grumble…

I was doing some HOT mapping on an old project in Nigeria recently and noticed that depending on how I access the project, I get different versions of the Bing imagery.

If I use the HOT tasking manager (either using iD or JOSM) or direct JOSM download as a starting point I get a lower resolution image that is clearly a different vintage than if I open it direct from the OSM page through the iD editor.

I can’t tell which is more recent as buildings appear and disappear in Nigeria so no telling without some local knowledge.

Someone suggested that it’s likely due to accessing different API endpoints (which I don’t quite know what this means).

Time for some more investigating. I’d love to be able to use both sets of images. Maybe I’ll post on why I want to do that as a separate entry when I get a free moment.

Here’s how to check cycling mapping mistakes and fixme’s in your area:

1. Go to Bicycle tags map
2. From upper left corner, select “bugs in tags”
3. Zoom into area of interest
4. From menu on the right you can select/deselect features to show

This way I could see a few fixme’s in my area, plan a route with OsmAnd application, observe and make necessary updates to the map in Oulu area.

And on my way yesterday I was able to visit the new separated cycleway opened the same day. Really liked to ride it. Have a look from our Baana Engineer’s twitter video.

Happy cycling, everyone!

Juhani

This event was an interaction with local youth contributors of various universities and organizations. Along with a three-day long Mapathon was held in this program.

I have just updated some structures( as-builts) around National Capital District in Port Moresby in PNG. After seeing some street having awkward shapes(partially incomplete), I have deleted these and updated with correct tags. Most of the roads did not have correct tags( as most roads in PNG residential and rural areas have 6.0 m width as approved by Department of Works-PNG). I even updated the road surface based on the type of material the roads are built with( mostly asphalt, gravel and dirt/grass). Most Building do have Heights/Levels and using correct level tags, those Buildings not having the correct heights/Levels have been re-edited with correct tags. When also checking on Power transmission Pylons, the average Height is 30.0m, I have re-edited the pylon height again by setting the correct height. The type of landcover( whether grass, forest, concrete asphalt etc.) has also been updated of some streets that I was rechecking/verifying around National Capital District(NCD).

Thanks to the use of F4map.com, I was able to see the update in 3D after the edits were made 48Hrs later. Please do use correct tags in OSM to improve OSM maps.

Once again, thankyou and happy mapping to you all Mappers.

the person writing this piece of diary is by now a middle aged man, in his 50s, still passionate about all that he does, or he simply won’t do it. for reasons which might be clear to a psychologist, but not to a mathematician like the person in question, he assumes the same passion and intellectual correctness in his colleagues, even in the face of proof to the contrary.

since 1989 he left his home town, never settled for longer than 8 years, now since October 2016 living in Panamá, speaking the language as any native latin speaker, that is with a decent linguistic awareness, and with an accent making him sound a mix of French, Colombian and obviously Southern Italian. but language is not the whole story, and regardless his “permanent resident” status, he doubts how not to feel as an alien here in Panamá.

I’ll now switch to writing in first person.

when it had become clear I would stay here for a longer spell, that was around the end of 2018, I looked for ways to collect people around the common OSM interest, I found the very sleepy Panama forum and I founded a Telegram group, and started monitoring new mappers coming to contribute to the map, inviting them to come to the group, and form a local community.

… See full entry

mod_tile, consisting of libapache2-mod-tile and renderd, to instruct Mapnik to generate raster tile images and deliver them via a web server has reached version 0.6 through a broad and constructive collaboration among Free and Open Source Software contributors. And the installation packages have recently become part of Debian and Ubuntu.

OpenStreetMap.org and many other web map tile servers are using mod_tile with Mapnik to generate and render raster tile images and with Apache2 to make them availabe serving on a webserver. For example for providing a slippy map on the web.

mod_tile has been been actively implemented between 2008 and 2014 by a core group of contributors. The last release was nine years ago when I assumed responsibility for maintenance, at the same there were also many good code suggestions waiting in the pipeline as pull requests on Github.

… See full entry