arxiv: 2605.11099 · v1 · submitted 2026-05-11 · 🌌 astro-ph.IM · astro-ph.CO· astro-ph.GA

Recognition: no theorem link

Survey Footprint Explorer: A Browser-Based Interactive Tool for Visualizing and Cross-Matching Astronomical Survey Footprints

S. L. Ahad (1 , 2 , 3) , R. Brilenkov (4 , 5) , J. E. Taylor (1 , 2) ((1) Waterloo Centre for Astrophysics , (2) Department of Physics

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Astronomy University of Waterloo (3) CASSA Independent University Bangladesh (4) Kapteyn Astronomical Institute (5) Definity Insurance Company Canada)

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Pith reviewed 2026-05-13 00:55 UTC · model grok-4.3

classification 🌌 astro-ph.IM astro-ph.COastro-ph.GA

keywords survey footprintsMOC mapsclient-side JavaScriptastronomical surveysfootprint visualizationcross-matchingbrowser toolAladin Lite

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The pith

A browser-based tool performs all survey footprint intersections and catalog cross-matching entirely client-side.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper presents the Survey Footprint Explorer as an interactive web application that visualizes the sky footprints of thirteen major astronomical surveys using Multi-Order Coverage maps. The tool runs completely in the user's browser with JavaScript, providing globe and projection views along with the ability to compute overlaps and check source membership without any server. A sympathetic reader would care because it democratizes access to survey comparison tools, allowing immediate use for planning observations or analyzing multi-wavelength data. The design eliminates the need for software installation or backend infrastructure.

Core claim

The paper describes the Survey Footprint Explorer v2.5.0, which encodes thirteen survey footprints as MOC maps and renders them via Aladin Lite v2 on an interactive globe and an equirectangular projection, while executing all intersection calculations, overlap area computations, and per-source membership tests entirely in client-side JavaScript.

What carries the argument

Client-side JavaScript implementation of MOC map intersections combined with Aladin Lite v2 for interactive visualization and support for uploading source catalogs to append survey membership flags.

Load-bearing premise

The MOC maps accurately represent the true survey footprints and the JavaScript code handles intersection logic and large catalog processing correctly and efficiently.

What would settle it

Running the tool on a test catalog where the membership of specific sources in a known survey is verified against an independent calculation and finding mismatches in the boolean flags or overlap areas.

Figures

Figures reproduced from arXiv: 2605.11099 by 2, 2) ((1) Waterloo Centre for Astrophysics, (2) Department of Physics, 3), (3) CASSA, (4) Kapteyn Astronomical Institute, 5), (5) Definity Insurance Company, Astronomy, Bangladesh, Canada), Independent University, J. E. Taylor (1, R. Brilenkov (4, S. L. Ahad (1, University of Waterloo.

**Figure 1.** Figure 1: Survey selection. surveys may be selected simultaneously; their footprint overlays are rendered in the order they appear in the list, with the survey at the top of the list drawn on top. The user may drag and reorder surveys within the list to control layering. A “Select all” option is available for rapid global comparison. The sidebar Coverage panel displays the number of currently selected surveys and,… view at source ↗

**Figure 2.** Figure 2: Use Case A: overlap quantification across Euclid DR1, LSST WFD, and Roman HLWAS. [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗

**Figure 3.** Figure 3: Use Case B: source-catalogue membership analysis. App-oriented view of catalogue upload and [PITH_FULL_IMAGE:figures/full_fig_p008_3.png] view at source ↗

**Figure 4.** Figure 4: Use Case C: overlap quantification across Euclid DR1, LSST WFD, and a custom [PITH_FULL_IMAGE:figures/full_fig_p008_4.png] view at source ↗

read the original abstract

We present the Survey Footprint Explorer (v2.5.0), a browser-based interactive tool for visualising and comparing the sky footprints of major astronomical imaging surveys. The tool is implemented entirely in client-side JavaScript and requires no server infrastructure, making it immediately accessible from any modern web browser. Thirteen survey footprints are currently included: Euclid DR1, LSST Wide-Fast-Deep, the Nancy Grace Roman HLWAS and HLTDS (full and deep tiers), DESI Legacy Imaging Survey DR9, the Dark Energy Survey (DES), the Subaru Hyper Suprime-Cam survey (HSC), the Kilo-Degree Survey (KiDS), the Ultraviolet Near-Infrared Optical Northern Survey (UNIONS), the eROSITA All-Sky Survey (eRASS1), and the Atacama Cosmology Telescope Legacy (ACT) survey spanning wavelengths from X-ray to near-infrared and covering footprints from 7.7 deg$^{2}$ to 21,524.4 deg$^{2}$. Survey footprints are encoded as Multi-Order Coverage (MOC) maps and rendered via two complementary views: an interactive globe powered by Aladin Lite v2, and a full-sky equirectangular projection. All MOC intersection calculations, including multi-survey overlap area computation and per-source membership testing, are performed client-side. Users may upload source catalogues in CSV or TSV format and download an augmented version with boolean survey membership columns appended. The link to access the tool is provided at the end of the Summary section.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

A practical client-side browser tool for survey footprint visualization and catalog cross-matching, but without any performance benchmarks.

read the letter

The main thing here is a browser-based tool for visualizing and cross-matching footprints from thirteen surveys, with all the MOC calculations running client-side in JavaScript. It includes a catalog upload feature that adds membership flags. The paper does well by specifying the exact surveys covered, from Euclid to ACT, and describing the two views: the Aladin Lite globe and the equirectangular map. The no-server requirement makes it easy to access and use right away. The soft spot is the lack of any performance data. The abstract claims the intersections work client-side, but without benchmarks for large catalogs or complex overlaps, it's not clear how well it scales in practice. Browser limits could become an issue, and the paper doesn't test or discuss that. This is aimed at astronomers who need a quick way to explore survey coverage or tag sources across datasets. It fills a practical niche without claiming big scientific advances. It deserves peer review. The implementation sounds functional, and feedback on adding some usage tests would strengthen it.

Referee Report

1 major / 0 minor

Summary. The manuscript presents the Survey Footprint Explorer (v2.5.0), a browser-based interactive tool for visualizing and cross-matching the footprints of 13 major astronomical surveys. Footprints are represented as Multi-Order Coverage (MOC) maps and displayed in both an Aladin Lite-powered interactive globe and a full-sky equirectangular projection. All computations, including overlap areas and catalog membership testing, are performed entirely in client-side JavaScript, with no server required. Users can upload CSV/TSV catalogs and download augmented versions with membership flags.

Significance. If the implementation performs as described, this tool offers practical value to the astronomical community by providing an immediately accessible, server-free platform for exploring survey overlaps and performing basic cross-matches. The fully client-side design using established MOC standards and Aladin Lite v2 is a clear strength, eliminating infrastructure barriers and supporting reproducibility. This could streamline tasks such as survey planning and source selection, provided scalability is demonstrated.

major comments (1)

Abstract: The central claim that 'All MOC intersection calculations, including multi-survey overlap area computation and per-source membership testing, are performed client-side' is presented without any benchmarks, timing data, memory usage analysis, or tests for realistic catalog sizes (e.g., 10^5–10^6 sources) against the largest MOC (21,524.4 deg²). Browser JS constraints on memory and single-threaded execution make this a load-bearing assumption for the tool's claimed usability; explicit performance evaluation or documented limitations are needed to substantiate the feature.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their constructive review and positive assessment of the Survey Footprint Explorer's practical value to the community. We address the single major comment below and have revised the manuscript accordingly to strengthen the performance claims.

read point-by-point responses

Referee: Abstract: The central claim that 'All MOC intersection calculations, including multi-survey overlap area computation and per-source membership testing, are performed client-side' is presented without any benchmarks, timing data, memory usage analysis, or tests for realistic catalog sizes (e.g., 10^5–10^6 sources) against the largest MOC (21,524.4 deg²). Browser JS constraints on memory and single-threaded execution make this a load-bearing assumption for the tool's claimed usability; explicit performance evaluation or documented limitations are needed to substantiate the feature.

Authors: We agree that the absence of explicit performance benchmarks leaves the client-side claim insufficiently substantiated, particularly given known browser constraints on memory and execution. In the revised manuscript we will add a dedicated performance evaluation subsection (placed after the description of the MOC intersection algorithms) that reports wall-clock timing and peak memory usage for catalog sizes from 10^4 to 10^6 sources. Tests will be performed against the largest included MOC (21,524.4 deg²) in representative modern browsers (Chrome, Firefox, Safari) on both desktop and laptop hardware. We will also document any observed limitations (e.g., browser tab memory caps or single-thread slowdowns) and provide guidance on expected run times. These additions directly address the referee's concern and allow readers to assess the tool's usability for realistic workloads. revision: yes

Circularity Check

0 steps flagged

No circularity: pure software tool description with no derivations

full rationale

The paper describes the implementation and features of a client-side JavaScript web tool for visualizing and cross-matching survey footprints using MOC maps. There are no mathematical derivations, predictions, fitted parameters, uniqueness theorems, or ansatzes presented. Claims about client-side computation are statements of design and implementation, not reductions of outputs to inputs by construction. No self-citations are load-bearing for any central result. The work is self-contained as a tool announcement.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

As this is a software tool paper rather than a scientific model, there are no free parameters fitted to data, no additional axioms beyond standard web technologies, and no invented physical entities.

pith-pipeline@v0.9.0 · 5673 in / 962 out tokens · 50201 ms · 2026-05-13T00:55:57.133388+00:00 · methodology

discussion (0)

Reference graph

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