Palangka

Palangka Raya · New town

A city core laid out from nothing in 1957 and once proposed as the capital. Broad axes named after national figures; the second planned capital-scale city in this set, and the one that can be placed beside IKN.

Drive

Fig. 1 · r = 800 m — The drivable network inside the sampling disc. Uniform ink, no road-class hierarchy, no basemap: the shape is the subject.

Drive H 2.476 · φ 0.75

Orientation entropy: 2.476nat
H / H max: 0.691
φ orientation-order: 0.754
Circuity: 1.447~473
Average node degree: 2.58
Four-way: 10.1%
Dead-end: 21.3%
Intersection density: 241 /km²
Median segment length: 35 m
Network length: 45.1 km

H is in nats — the natural-log unit of information. That is why its maximum is ln 36 ≈ 3.584 rather than log₂ 36.

Circuity is an estimate: network distance over straight-line distance, averaged across a seeded sample of node pairs rather than across all of them. 473 pairs sampled · 18 pairs unreachable Pairs with no route between them at all are excluded from the mean. A large count means this network is fragmented — a signal about the data, not about the place.

Where these come from

Nodes: 703
Edges: 906
Intersections (degree ≥ 3): 485
Disc area: 2.01 km²
Intersection density: 241 /km²
Rose weighted length: 90.1 km
Per-edge circuity: 1.075

The intermediate values the column above is built from. Intersection density is the intersection count over the disc area; the weighted length is the denominator that turns a rose bar into a share. Two different circuity measures: the per-edge one compares each segment against its own chord, the sampled one compares distances between junctions. The first measures how much streets bend, the second how far out of your way the network takes you.

Walk

Fig. 2 · r = 800 m — The walkable network at the same centre, the same disc, the same extract. Every difference from the drawing beside it is the tag mapping, not a different place.

Walk H 2.532 · φ 0.73

Orientation entropy: 2.532nat
H / H max: 0.707
φ orientation-order: 0.728
Circuity: 1.375~436
Average node degree: 2.61
Four-way: 15.7%
Dead-end: 22.5%
Intersection density: 376 /km²
Median segment length: 25 m
Network length: 58.5 km

H is in nats — the natural-log unit of information. That is why its maximum is ln 36 ≈ 3.584 rather than log₂ 36.

Circuity is an estimate: network distance over straight-line distance, averaged across a seeded sample of node pairs rather than across all of them. 436 pairs sampled · 46 pairs unreachable Pairs with no route between them at all are excluded from the mean. A large count means this network is fragmented — a signal about the data, not about the place.

Where these come from

Nodes: 1112
Edges: 1453
Intersections (degree ≥ 3): 755
Disc area: 2.01 km²
Intersection density: 376 /km²
Rose weighted length: 117.1 km
Per-edge circuity: 1.063

Both roses overlaid

Drive H 2.476 · φ 0.75Walk H 2.532 · φ 0.73

Each street segment’s bearing goes into one of 36 bins of 10°, weighted by length: a 500 m road counts ten times a 50 m gang. Bar length is the share of network length running that way, not a count of segments. The rose is always 180°-symmetric, because one segment traversed both ways differs by exactly 180°. Boeing 2019 §3

Drive
Walk
Both

DeltaWalk − Drive

Orientation entropy: +0.056
H / H max: +0.016
φ orientation-order: −0.026
Circuity: −0.072
Average node degree: +0.04
Four-way: +5.6%
Dead-end: +1.1%
Intersection density: +134
Median segment length: −10
Network length: +13.5

What walking adds

Walk-only length: 13.5 km
Share of walking network: 23.0%

Fig. 3 · r = 800 m — Ink: the edges that exist only in the walking network. Hairline: the network both modes share. Membership is decided by the tag mapping — an edge counts as walk-only when the OSM way it came from is not admitted to the driving network.

Rose as a table — 36 bins — Palangka

Share of network length per 10° bearing bin, for drive and walk.
Bin	Bearing range	P — Drive	P — Walk	−P·ln P	−P·ln P
00	355°–5°	0.61%	0.89%	0.0311	0.0419
01	5°–15°	0.51%	0.65%	0.0271	0.0325
02	15°–25°	1.54%	1.42%	0.0644	0.0604
03	25°–35°	0.56%	0.57%	0.0291	0.0296
04	35°–45°	0.31%	0.42%	0.0180	0.0231
05	45°–55°	0.66%	0.78%	0.0332	0.0379
06	55°–65°	18.51%	19.59%	0.3122	0.3194
07	65°–75°	0.68%	0.62%	0.0339	0.0314
08	75°–85°	0.36%	0.60%	0.0201	0.0308
09	85°–95°	0.25%	0.62%	0.0147	0.0316
10	95°–105°	2.30%	2.05%	0.0869	0.0796
11	105°–115°	1.89%	1.70%	0.0751	0.0693
12	115°–125°	1.04%	0.94%	0.0474	0.0439
13	125°–135°	0.37%	0.46%	0.0208	0.0247
14	135°–145°	0.79%	0.76%	0.0384	0.0373
15	145°–155°	18.01%	16.34%	0.3087	0.2960
16	155°–165°	0.98%	0.84%	0.0453	0.0403
17	165°–175°	0.63%	0.74%	0.0318	0.0364
18	175°–185°	0.61%	0.89%	0.0311	0.0419
19	185°–195°	0.51%	0.65%	0.0271	0.0325
20	195°–205°	1.54%	1.42%	0.0644	0.0604
21	205°–215°	0.56%	0.57%	0.0291	0.0296
22	215°–225°	0.31%	0.42%	0.0180	0.0231
23	225°–235°	0.66%	0.78%	0.0332	0.0379
24	235°–245°	18.51%	19.59%	0.3122	0.3194
25	245°–255°	0.68%	0.62%	0.0339	0.0314
26	255°–265°	0.36%	0.60%	0.0201	0.0308
27	265°–275°	0.25%	0.62%	0.0147	0.0316
28	275°–285°	2.30%	2.05%	0.0869	0.0796
29	285°–295°	1.89%	1.70%	0.0751	0.0693
30	295°–305°	1.04%	0.94%	0.0474	0.0439
31	305°–315°	0.37%	0.46%	0.0208	0.0247
32	315°–325°	0.79%	0.76%	0.0384	0.0373
33	325°–335°	18.01%	16.34%	0.3087	0.2960
34	335°–345°	0.98%	0.84%	0.0453	0.0403
35	345°–355°	0.63%	0.74%	0.0318	0.0364
Sum = H				2.476	2.532

The last column is each bin’s term in H = −Σ P(i)·ln P(i). Add the thirty-six of them and you get the H printed under the rose. An empty bin contributes zero.

Note

The core of Palangka Raya was laid out from nothing in 1957 and was once proposed as the capital. Its orientation entropy is the lowest in this set: its streets run along a small number of bearings, far fewer than any kampung here.

IKN, the next planned capital, sits at the opposite end of the same measure. Two planned capitals, sixty years apart, both decisions taken on paper. This tool shows that they differ; it does not say why, and it does not say which is better.

One bound on the reading: about a fifth of its pedestrian network lies inside mapped green space. The figure clears the threshold without it, but footway coverage cannot tell a park path from a gang, and here some of it is a park path.

Download this site’s data (JSON, ODbL)

Data jalan © OpenStreetMap contributors, ODbL 1.0. Basis data turunan ini ditawarkan dengan lisensi yang sama. · Boeing, G. 2019. Urban Spatial Order: Street Network Orientation, Configuration, and Entropy. Applied Network Science 4(1):67.