Deep Learning for Infrastructure Assessment in Africa using Remote Sensing Data
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1 Deep Learning for Infrastructure Assessment in Africa using Remote Sensing Data Pascaline Dupas Department of Economics, Stanford University Data for Development Stanford Center on Global Poverty and Development
2 Goals: 1-Use satellite imagery to identify basic measures of physical infrastructure and provision of public goods 2-Use these measures of physical infrastructure as dependent variables in economic analyses
3 Introduction: Why measure infrastructure access? Better understand quality of life and its spatial distribution Effectively plan & distribute resources Keep leaders aware and accountable Support developing regions
4 Background / Related Work 1. Using satellite images to predict land use Albert, et al. (2017) used state-of-art deep convolutional neural nets (VGG-16 & ResNet) to analyze patterns in land use in urban settings with large scale satellite data. The prediction accuracy ranged between 0.7 to Using other data sources to detect infrastructure Mnih and Hinton (2011) used a Restricted Boltzmann Machines structure by feeding in images. They predicted whether a small block of pixels was a road or not, and were able to get around 0.87 test accuracy 3. Using night lights to proxy for development (Economics)
5 Background / Related Work 1. Using satellite images to predict land use Albert, et al. (2017) used state-of-art deep convolutional neural nets (VGG-16 & ResNet) to analyze patterns in land use in urban settings with large scale satellite data. The prediction accuracy ranged between 0.7 to Using other data sources to detect infrastructure Mnih and Hinton (2011) used a Restricted Boltzmann Machines structure by feeding in images. They predicted whether a small block of pixels was a road or not, and were able to get around 0.87 test accuracy 3. Using night lights to proxy for development (Economics)
6 Economic Development from Space
7 Afrobarometer Round 6 ( ) Field surveys 36 African countries 7022 enumeration areas (EAs) surveyor-assessed measures of access to basic infrastructure (piped water, sewerage, etc.) eapipedwater: long
8 Satellite Imagery satellite Landsat 8 (l8) Sentinel 1 (s1) # bands 6 5 resolution 30m 15m original image size 500 x 500 pixels 500 x 500 pixels interpretation reflectance backscatter
9 6 Band Landsat 8 Results Meaningful predictions, far surpassing random chance and with ROCs good quality. Best performance on sewerage, electricity, and piped water access. Weak performance on fields hard to detect from imagery. On par with state of the art classification results (Albert et al 2017, Value Balance Accuracy F1 ROC Sewerage Electricity Piped Water Road Post Office Bank
10 Step 2: Using the new measures to fight poverty Apply trained CNN on all inhabited pixels on the African continent Generate predictions Study distribution Targeting -- Areas lagging behind? Determinants of infrastructure placement, patronage, ethnic politics
11 Step 2: Using the new measures to fight poverty Work in progress Stay tuned!
12 Appendix Slides
13 Relevant Metrics F1-score (F1) Area under ROC curve (ROC) probability that classifier will rank a randomly chosen positive example higher than a randomly chosen negative example
14 6 Band Landsat 8 Results Meaningful predictions, far surpassing random chance and with ROCs good quality. Best performance on sewerage, electricity, and piped water access. Weak performance on fields hard to detect from imagery. On par with state of the art classification results (Albert et al 2017, Value Balance Accuracy F1 ROC Sewerage Electricity Piped Water Road Post Office Bank
15 6 Band Landsat 8 Results eapipedwater:
16 Comparing to Baselines: OSM Model Value Balance Accuracy F1 ROC Sewerage Electricity Piped Water OSM Baseline Value Balance Accuracy F1 ROC Sewerage Electricity Piped Water The Model surpasses the OSM baseline on all three of its most successful measures.
17 Comparing to Baselines: Nightlights Model Value Balance Accuracy F1 ROC Sewerage Electricity Piped Water Nightlights Baseline Value Balance Accuracy F1 ROC Sewerage Electricity Piped Water The model surpasses nightlights, even on electricity.
18 Comparing to Baselines: Oracle Model Value Balance Accuracy F1 ROC Sewerage Electricity Piped Water Oracle Value Balance Accuracy F1 ROC Sewerage Electricity Piped Water The model is on par with the Oracle, demonstrating that is finding almost as much signal as it can.
19 This quarter,
20 Goals Inclusion of previous Afrobarometer Rounds Scaling project with OSM Data Model interpretability Experiments for the Paper
21 Afrobarometer Tasks: 1. Improve base model with previous rounds of the Afrobarometer dataset 2. Predict previous time spans from future time spans (predict rounds 1-3 with rounds 4-6) 3. Test for temporal aspects in repeat areas (if there are any)
22 DeepOSM for Infrastructure Premise, Afrobarometer dataset remains limited and noisy (quality is subjective) OSM might be the best chance to scale this project (infrastructure is a huge category and we should leverage all existing sources) Google Static Maps API (25,000 free images / day) has satellite images at all scales
23 Proposal Choose the most relevant tags in OSM related to infrastructure Align tags with satellite imagery Use R-CNN to detect tags Then, use all Afrobarometer rounds as validation data Open question: how to relate trained OSM model to Afrobarometer prediction
24 Model Interpretability Tasks: 1. Salience maps 2. Attention layers 3. Interpretable CNNs
25 Experiments Tasks: 1. Country holdout 2. One-shot learning in new countries 3. Temporal forecasting
arxiv: v1 [stat.ml] 10 Nov 2017
Poverty Prediction with Public Landsat 7 Satellite Imagery and Machine Learning arxiv:1711.03654v1 [stat.ml] 10 Nov 2017 Anthony Perez Department of Computer Science Stanford, CA 94305 aperez8@stanford.edu
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