I recently returned from a week trekking in Nepal’s Langtang National Park. I did my best to collect data on the whole trip for OpenStreetMap. Here’s how you can do it, too.
On a week-long trek you will spend a lot of time hiking, talking with your friends, and looking at scenery. You should also probably bring some books and things for downtime and rainy days.
Mapping can be fun, too! Think of it as a scavenger hunt where the goal is to find everything.
Langtang is easier than other treks in the country, and much easier than any IMAX film you’ve seen where people were climbing ice walls. That said - seasons matter, weather matters, your personal health and fitness matters. Research. I biked daily and got altitude sickness medication from a travel clinic to prepare myself. I felt under-prepared and wish I’d done some high-altitude hiking beforehand.
There are only a couple of well-defined trails, so it’s difficult to get lost. Every hour or so there are guest houses where you can get food or stay overnight.
Travel with a group so someone will know if you fall or get sick. This could be the most important advice you ever read. Travel with a group.
A towel, a thin blanket or sleeping bag, sunscreen, a light raincoat, a sweatshirt, a winter jacket and gloves, binoculars, Nepali currency (especially bills less than 1000 Rs), long paperback book or Kindle. Water purification tablets or UV wand, hand sanitizer, toilet paper and other countermeasures.
Bring multiple passport-sized photos so you can enter the country and get a TIMS card
For mapping: smartphone with standard US or UK charger, plus a backup battery that can recharge your phone multiple times. On my Android phone, I use the My Tracks app.
Every guesthouse has roughly the same items. If you see a unique item it’s in your best interest to order it; not because it’s a specialty, but because it’s something different.
Guest houses offer vegetarian meals including eggs, pancakes, naan, pasta, pizza, fried rice, mo:mo: dumplings, cake, tea, coffee, beer, soda, and Nepali specialties. Dal bhat is the best Nepali food because you get rice, vegetables, and soup with infinite refills for all three. Dal bhat is also slightly different at each place you go.
You can buy more toilet paper, bottled water, and a recharge from most places, but it’s always good to bring your own TP, water purification, and backup battery.
About half of the area is covered by good-resolution satellite photos from Bing. The other half is a nondescript blur. A couple of in-person mappers had already uploaded decent GPS traces, points of interest, and village names to OpenStreetMap. On Google Maps, satellite coverage is more complete, but the trails and other details are not mapped.
Whether you’re the bus and on foot, recording and uploading a GPS trace makes it easier to figure out where the road is. Even in a satellite-covered area, your trace can help answer questions like: is the imagery aligned correctly? Were changes made to the road? Where does the road go in this tree-covered area?
The My Tracks app has a pushpin button which allows you to insert a short note about your location. Some of my notes include “shrine”, “Dorje Bakery”, and “Pilgrim Guest House closer to river”. Use the space to record a name properly or remember a good location later.
The monasteries and also the towers called stupas are part of Tibetan Buddhism. There are several rock walls, also called stupa, where the road splits and you’re expected to go around on the left side. All should be tagged as amenity=place_of_worship with Buddhism as the religion. Some say a stupa should be tagged tower=stupa, but I don’t know if it’s true, and it looks like an electrical power pole on the map. Our guide also showed us a rock with a hole through it, covered in scarves and other offerings. He told us local folklore involving the Adam and Eve of yaks. This appeared to predate Buddhism or Hinduism, so I tagged it with a different religion.
There are a lot of guest houses. I don’t think anyone is going to map them all, so just get what you can. From a humanitarian perspective, it might be more helpful to map schools, health clinics, wells, and other places frequented by local people.
Comment from malenki on 17 May 2014 at 07:31
A very good summary!
Two remarks I have to make:
with amenity:house of prayer you surely mean amenity=place_of_worship?
For not mapping streams: I agree it is not worth the effort to try to get a GPS log of its banks on-site but it is still worth the effort to map it based on aerial imagery as long as one can distinguish it from other features.
For the guest houses: if you cannot map them all, map all-¹ :)
When you make photos during trekking, you can also use them as data source for Mapping: https://wiki.osm.org/wiki/Photo_mapping
An recently developed nice app to combine photographs, mapping and Smartphones is Mapillary.
Comment from mapmeld on 17 May 2014 at 08:59
@malenki thanks! fixed
I haven’t had a chance to see if my photos have geo metadata. I’ll take a look at Mapillary.
Comment from Rps333 on 17 May 2014 at 12:01
Great story! Have you had a look at the Strava Heat Map and Slide? Great way to map trails.
Comment from zarl on 17 May 2014 at 13:48
Mapping a few available hints about streams makes a lot of sense, since this can help others as a landmark. So tag the bridge (or ford) plus just a few meters of the river or stream so that others get an idea about the direction in which the water flows.
Using your gpx files (or other files with the coordinates of your hike) the right coordinates can later be added to your photos, it’s really easy. If the camera’s clock isn’t set properly you can also fix the offset, exiftool works great for this.