Using satellite technology for flood control and land use planning

Using satellite technology for flood control and land use planning is certainly a good practice in science-driven governance. But let us be clear—it is not the only tool we need for these urgent problems. Sometimes, I wonder whether our government is too enamored with “new” technology when in fact there are already existing data sets available, even without satellites.

I am very sure that PHIVOLCS, NAMRIA, MMDA, DENR, and the now-quiet UP Project NOAH already have valuable maps, surveys, and models in their files. Add to that, LGUs are supposed to maintain their own land use plans using Geographic Information Systems (GIS). These systems are not futuristic—they are here and should be working. So, why aren’t we making better use of them?

Having said that, let me also recognize the Department of Human Settlements and Urban Development (DHSUD) for working with the Philippine Space Agency (PhilSA). Their idea is to use satellites to detect land use violations that cause flooding in Metro Manila and elsewhere. Assistant Secretary Mylene Rivera is correct: flooding is not only an engineering problem—it is a land use planning problem. When subdivisions, malls, or even factories are allowed to sprout in low-lying areas, and when settlers are forced to live along rivers and easements, then of course waterways narrow, and floods become inevitable.

The DHSUD-PhilSA partnership will roll out a Land Use Compliance Assessment Monitoring System next year. By overlaying satellite images with LGU maps, zoning violations will be visible. That is a good idea. As Rivera said, “You can’t hide anymore.” But let me ask: why are we waiting for satellites to expose what is already obvious on the ground? Drones are now cheap and easy to deploy, and combined with existing maps, they can give a real-time picture of violations. Even barangays could use them.

What the government should really do is integrate all these streams of data—satellites, drones, LGU GIS systems, DENR maps, NAMRIA surveys—into one unified, accessible database. Imagine how powerful that would be for both flood control and land use planning. Right now, it seems that agencies hold their own “silos” of information, reluctant to share. This must change.

Flood control planning, in simple terms, should be GIS-based. No independent flood control project should proceed without alignment to the land use plan. But in the Philippines, we often see the opposite. A road is widened here, a dike is built there, a reclamation project is approved somewhere else—with no integration. Later, when floods worsen, we blame the rains instead of poor planning.

Let me also highlight the government’s 4PH program, which promises safer and affordable housing for low-income families. If it truly follows a strict Site Suitability Assessment, then it could be part of the long-term solution by moving families out of danger zones. But I would caution: how strict will this really be? Will political influence creep in, allowing projects in unsafe areas anyway? We have seen this story before.

I also worry about local capacity. If LGUs are required to maintain GIS-based land use plans, do they have the staff and resources to do so? Some LGUs may not even have a single GIS specialist. Perhaps the national government should fund shared GIS centers that small towns can access. Otherwise, the best satellite imagery in the world will not help if the ground-level governance is weak.

In fairness, satellite technology does offer remarkable capabilities. Real-time monitoring, predictive modeling, and post-flood damage assessment are tools we cannot ignore, especially with stronger typhoons and rising sea levels. But let us not forget that “high-tech” should always be combined with “common sense.” Floods can often be prevented simply by keeping easements clear, not reclaiming wetlands, and respecting ecological buffers.

So yes, let us welcome satellites into our toolbox. But let us also demand that the government make full use of existing data, deploy drones widely, strengthen LGU GIS systems, and most of all, enforce the rules we already have. Flooding is not just about storms—it is about discipline, planning, and the political will to say “no” to dangerous land use.

If we cannot even do that, then no satellite in the sky can save us.